In the nick of time
This phrase might be a little puzzling when you think about it. What does a random, common name have to do with time? But “nick” in this phrase doesn’t refer to a person’s name. In the 1500s, a “nick” was reportedly a word for a small, precise marker. Because of this, “in the nick” or “in the very nick” meant “at the exact right moment.” The phrase evolved to refer to time with “in the nick of time” or “just in the nick of time.”
Let the cat out of the bag
This one goes way back – to the Middle Ages! It refers to shady salespeople in medieval marketplaces, who, when a customer would purchase a pig, would swindle them by secretly putting a cat in the bag instead of a pig. The customer would pay for a pig, and then when they got home and opened the bag – or, literally, let the cat out of the bag – they would realise that they’d been scammed. The expression has lasted all the way to today, and continues to refer to the revealing of a usually unpleasant secret!
Riding shotgun
If you immediately guessed that this was going to be one of the common English expressions with dark origins, you’d be right. We call the front seat of a car, next to the driver, “shotgun” because of a practice in the Old West. Wagon drivers would often be accompanied by men with shotguns, who would keep a lookout for robbers and bandits, using the shotgun to ward them off if need be. You’ll certainly see this practice depicted in Western films, but it does, in fact, derive from reality! And those Western movies, including the John Wayne film Stagecoach, helped popularise the expression “riding shotgun” to mean claiming the spot next to the driver.