Creepy lingo

You’ve said these (not so) innocent phrases your whole life: Learn more!

Image: Mathias Pinat

We toss out phrases like "bite the bullet" or "caught red-handed" without giving them a second thought. But some of our favorite everyday expressions began on battlefields, in prisons, and even on plague-ridden streets. Behind those cheerful turns of phrase are stories that range from weird to downright disturbing. Don’t worry, we’ll keep it light, but you might never hear these sayings the same way again.

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Before it described devoted fans or stubborn folks, "diehard" referred to soldiers who fought until their last breath. The term first appeared in the late 1700s to describe troops who refused to surrender. Today, it has lost its blood-and-battlefield meaning and simply signifies loyalty or persistence. So if you’re a diehard sports fan, you can safely keep your devotion on the couch instead of the battlefield.

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A rumor once claimed that "rule of thumb" came from an old law allowing men to beat their wives with sticks no wider than a thumb. That’s not true. The phrase actually originates from carpenters and brewers, who used their thumbs to make rough measurements before rulers were common. Over time, it picked up that false association, but its real roots are much less sinister and far more practical.

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These days, if someone is "pulling your leg," they’re joking around. But the phrase likely originated in 19th-century London, where thieves would trip their victims by tugging on their legs before robbing them. It wasn’t exactly harmless fun back then. Over time, the expression lost its sinister connotation and became something much friendlier: a playful way to tease without causing real harm.

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This phrase has one of the darkest origins on this list. In the early 1800s, enslaved people in the United States were sometimes sold "down the river" to plantations in the Deep South, where conditions were far harsher. It came to mean betrayal or being deceived, though given its painful history, it’s often considered best avoided today. There are plenty of ways to describe someone letting you down without echoing that dark past.

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In the old days, sailors being inspected had to line up perfectly, with their toes touching a marked plank on the deck. Failure to "toe the line" could result in punishment or extra duties. The phrase later took on a figurative meaning: staying within rules or meeting expectations. Today, it’s more about following office policy than avoiding a sailor’s scolding.

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For centuries, "hysteria" was wrongly attributed to the female body, particularly the uterus (from the Greek word hystera). Doctors once used this diagnosis for nearly any symptom in women, from sadness to laughter. By the 19th century, people began to understand that emotions were not tied to specific organs. Today, "hysterical" usually means someone is laughing uncontrollably or reacting with intense emotion, not suffering from an outdated medical myth.

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In the early 1900s, saloons would literally throw out freeloaders who came for the free lunch but didn’t buy a drink, rushing them to the door—a practice known as the "bum’s rush." Later, the phrase evolved into "bum rush," meaning to forcefully push in or overwhelm. These days, we might say a crowd "bum-rushed" the stage at a concert, but thankfully, no one is being tossed into the street.

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Centuries ago, when city streets were filthy and drainage was poor, heavy rain would sweep debris into the gutters—sometimes even animal carcasses. It’s believed that this grim sight inspired the phrase "raining cats and dogs." The image stuck, though thankfully the meaning softened over time. Today, it simply means it’s pouring outside, not that the sky is literally falling.

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Being "caught red-handed" originally referred to criminals literally found with blood on their hands after committing a violent act. The phrase first appeared in Scottish law in the 15th century. Over time, it took on a lighter meaning (thank God!), used for any kind of wrongdoing, big or small.

Image: National Cancer Institute

Before anesthesia, soldiers in pain were given something hard to bite on during surgery. Guess what? A bullet. It was a way to endure unbearable pain in silence. These days, "biting the bullet" just means bracing yourself for something unpleasant, like paying your taxes or opening a stack of bills. The modern version is much easier on the teeth.

Decoding

Being a "treasured guest" is not a compliment. This is the hidden meaning

Have you ever heard "Code Adam" while shopping for groceries at Walmart? Or maybe you’ve heard how "Dr. Firestone" was being paged during a routine hospital visit. They sound like harmless announcements. But behind these ordinary words are secret codes staff use to signal emergencies without causing panic. From hospitals and supermarkets to airports and Disney Parks, these phrases quietly warn employees that something is happening. You hope you never hear them, but if you do, it helps to know exactly what they mean.

We all love getting special attention at airports or hotel desks, but if you hear the clerk call you a "treasured guest," don’t feel so flattered. You may not be as VIP as one could think.

In the hospitality industry, "treasured guest" has become a humorous bit of industry folklore to describe someone causing trouble. Maybe a customer yelling at staff over expired coupons, demanding impossible accommodations, or throwing a full-blown tantrum at the front desk. Whatever it is, the phrase has become the staff’s secret way to warn co-workers without escalating the situation in front of the customers. Most guests don’t realize the meaning, but once you know it, you may start hearing it more often. We just hope it’s not about you.

Imagine you’re pushing a shopping cart through Walmart when suddenly the overhead speaker announces, "Code Adam." You can easily assume it’s some kind of employee meeting or cleanup request. But when you see them start locking the exits and moving around, you know something’s wrong.

This code was created in 1994 by Walmart in collaboration with the National Center for Missing & Exploited Children (NCMEC), in memory of the tragic case of 6-year-old Adam Walsh. Adam was abducted from a Sears department store in 1981 while shopping with his mother. His father, John Walsh, later became famous for hosting the TV program America’s Most Wanted and advocating for missing children. Even if Adam’s story ended in tragedy, Walmart created the emergency system in Adam’s memory, and other retailers soon adopted it nationwide, intending to have a quick response to missing or abducted children.

You’re sitting in a hospital waiting room during a routine check-up when you suddenly hear "Code Blue, Room 214." Most people immediately know it sounds serious, even if they are not entirely sure why.

The phrase "Code Blue" is used at hospitals to draw the necessary staff and equipment to perform a resuscitation. It was created in the early 1960s at Beathany Medical Center by Dr. Hughes Day. Before then, hospital resuscitations were often chaotic and poorly coordinated. In 1961, Dr. Day received a grant to build one of America’s first cardiac care centers, and he developed both the Code Blue alert system and the modern crash cart to improve survival rates during cardiac emergencies. Today, the system is used in hospitals across the country, sometimes with specialized versions like "Code Blue Pediatric" or "Code Blue Neonate."

Imagine visiting a loved one in the hospital when the intercom calmly announces, "Paging Dr. Firectone to the third floor." Your head surely goes, "Dr. Firestone’s probably having a busy day up there." He is, but it’s not what you think.

The phrase is actually a discreet fire alert used to warn staff about smoke, flames, or overheating equipment without frightening patients and visitors. Hospitals adopted these coded announcements after realizing that openly yelling "fire" over loudspeakers could create panic, especially among patients who aren’t able to move quickly. "Code Red" is an alternative used by many health centers today, but it also hints at the situation while keeping hallways calm.

You’re standing at a checkout counter when the cashier picks up the phone and quietly says, "I need a Code 10 authorization." If you think that’s just another way to get a supervisor’s approval or technical issue, think again. In reality, the cashier may suspect the credit card is stolen or fraudulent.

Code 10 was developed through a cooperative effort between major credit card companies like Visa and Mastercard, along with international standard organizations. As credit cards became more common in the 1960s and 1970s, stores needed a discreet way to alert banks about suspicious activity without directly accusing customers and potentially putting employees at danger. When a cashier requests a Code 10, the bank’s operator begins asking yes-or-no questions to assess the situation and guide the employee on what to do next.

You’ve probably experienced those long airport security lines. The wait is usually uneventful. But sometimes, you can hear "Code Bravo" over the speakers. Maybe it’s a delay, or maybe it’s an issue with luggage. Within seconds, people stop moving, the security line freezes, and exits may even close. It’s something bigger.

Code Bravo is the emergency phrase used by airport security and the Transportation Security Administration to signal a serious security threat, such as an unattended bag, a breach at a checkpoint, or someone slipping into a restricted area. The term comes from the international phonetic alphabet used in aviation and military communications, where "Bravo" represents the letter B. When this is called, security staff immediately lock down affected areas, stop screening lines, and search for the source of the threat. To passengers, it’s sudden and confusing, but to security, it’s a carefully rehearsed response.

You are heading back to your cabin on a cruise ship when the speakers announce, "Code Alpha, Deck 7." You may think Alpha is related to the captain, but that’s not the case. It means someone on board is suffering a medical emergency.

The phrase comes from the NATO phonetic alphabet, where "Alpha" represents the letter A. In maritime emergency jargon, it became shorthand for a Priority A medical situation requiring immediate response. Cruise lines such as Royal Caribbean and Disney Cruise Line commonly use the term, though some ships use variations like repeating "Alpha" three times. Once the code is announced, onboard medical teams rush toward the specified deck or cabin. If necessary, stretcher crews are mobilized, and in severe cases, the ship may even divert course toward the nearest port for emergency evacuation. Passengers are enjoying the views, but the staff is running to save a life.

Anyone who remembers the CB radio craze of the 1970s probably smiles when they hear "10-4." Movies, truckers, and radio fans turned those number codes into a part of American culture. So if you overhear "10-33" on a police scanner, you might assume it’s just another routine message. But it’s not as simple as it sounds.

The 10-code system was first created in 1937 by Illinois State Police communications director Charles Hopper and later standardized by the Association of Public Safety Communications Officials, better known as APCO. Officers needed short phrases they could understand clearly over crackling radio signals. The 10-33 code commonly means an officer needs emergency assistance. In some departments, it also signals radio silence so dispatchers can focus on the crisis unfolding in real time.

Disney World is amazing, the parks offer something for everyone, and there are things to see wherever you look. But that’s exactly the kind of place where a child can easily disappear into a sea of strollers, balloons, characters, and crowds. For that reason, Disney has developed the "Signal 70," which alerts cast members and security that a child has become separated from their family.

The number comes from older police and emergency radio systems, where "70" was commonly associated with missing persons. Disney adopted the phrase because it allows employees to communicate discreetly without frightening or alarming nearby guests. If a member finds the child, they gently -and magically- escort them to Baby Care Center, where they coordinate the reunion.

Cruises are great to relax, enjoying a good book under the sun with a nice drink by the side. Until you hear "Echo, echo, echo" on the speakers. If you do, something is happening somewhere else on the ship.

The code is used among cruise employees to signal that dangerous winds or a navigational hazard are affecting the ship. It comes from the international maritime phonetic alphabet, where "Echo" stands for the letter E. In maritime signalling, the letter traditionally means "I am altering my course to starboard." And, in time, the phrase became associated with urgent ship maneuvers and weather-related warnings. However urgent, the repetition of the word by three doesn’t represent life-threatening situations. It alerts the crew of a certain hazard to prepare while avoiding panic among passengers.