7 Latin Phrases You Pretend to Understand

1. Caveat Emptor
“Let the buyer beware”
Before money-back guarantees and 20-year warranties, caveat emptor was indispensable advice for the consumer. These days, it’d be more fitting to have it tattooed on the foreheads of used-car salesmen, infomercial actors, and prostitutes. For extra credit points, remember that caveat often makes solo appearances at cocktail parties as a fancy term for a warning or caution. Oh, and just so you know, caveat lector means “let the reader beware.”

2. Persona Non Grata
“An unacceptable person”
Remember your old buddy, the one everybody called Tank? Now picture him at a debutante ball, and you’ll start to get a sense of someone with persona non grata status. The term is most commonly used in diplomatic circles to indicate that a person is unwelcome due to ideological differences or a breach of trust. Sometimes, the tag refers to a pariah, a ne’er-do-well, or a killjoy, but it’s always subjective.

3. Habeas Corpus
“You have the body”
When you wake up in the New Orleans Parish Prison after a foggy night at Mardi Gras, remember this one. In a nutshell, habeas corpus is what separates us from savages. It’s the legal principle that guarantees an inmate the right to appear before a judge in court, so it can be determined whether or not that person is being lawfully imprisoned. It’s also one of the cornerstones of the American and British legal systems. Without it, tyrannical and unjust imprisonments would be possible. In situations where national security is at risk, however, habeas corpus can be suspended.

4. Cogito Ergo Sum
“I think, therefore I am”
When all those spirited mental wrestling matches you have about existentialism start growing old (yeah, right!), you can always put an end to the debate with cogito ergo sum. Descartes, the 17th-century French philosopher, coined the phrase as a means of justifying reality. According to him, nothing in life could be proven except one’s thoughts. That makes sense, right?


5. Quid Pro Quo
“You scratch my back, I’ll scratch yours”
Given that quid pro quo refers to a deal or trade, it’s no wonder the Brits nicknamed their almighty pound the “quid.” And if you give someone some quid, you’re going to expect some quo. The phrase often lives in the courtroom, where guilt and innocence are the currency. It’s the oil that lubricates our legal system.

6. Ad Hominem
“To attack the man”
In the world of public discourse, ad hominem is a means of attacking one’s rhetorical opponent by questioning his or her reputation or expertise rather than sticking to the issue at hand. Translation: Politicians are really good at it. People who resort to ad hominem techniques are usually derided as having a diluted argument or lack of discipline. If pressed, they’ll brandish it like a saber and refuse to get back to the heart of the matter. Who said the debate team doesn’t have sex appeal?

7. Memento Mori
“Remember, you must die”
Carpe diem is so 20th century. If you’re going to suck the marrow out of life, trying doing it with the honest, irrefutable, and no less inspiring memento mori. You can interpret the phrase in two ways: Eat, drink, and party down. Or, less hedonistically, be good so you can get past the pearly gates. Naturally, the latter was the one preferred by the early Christian Church, which would use macabre art—including dancing skeletons and snuffed-out candles—to remind the faithful to forgo temporal pleasures in favor of eternal bliss in heaven. The phrase also served to prevent swelling heads. Some historians say that victorious, parading Roman generals would have servants stand behind them and whisper “memento mori” in their ears to keep their egos in check.