The phrase keep your shirt on means to calm down. This expression might be used in situations where a person is riled up or excited about something—it’s basically a way of saying relax.
Example: I borrowed my friend’s laptop for a week. On the day I was supposed to give it back, I accidentally spilled water all over it! Needless to say, he wasn’t happy. So I told him to keep his shirt on because I would compensate for my mistake by buying him a new one.
Synonyms / Similar Phrases:
1. Cool it
2. Cool your jets
3. Simmer down
The Origin Of ‘Keep Your Shirt On’
The origin of this phrase is unclear, however, it might have something to do with people getting angry. What I mean is, sometimes people get so angry that they get into physical fights with others. And if that happens, they might take off their shirt before the conflict starts. Why?
Well, shirts can restrict a person’s movement to an extent, especially if it’s a tighter fitting one. By removing the shirt, it allows the upper body to move around a bit more freely. It’s like wearing a pair of jeans, the legs can still move in them, but not as well.
Anyways, since angry people sometimes react by taking off their shirt for a fight, maybe the people not interested in having a brawl would tell them literally, to keep it on!
Now let’s talk about how old the idiom keep your shirt on is. The earliest I’ve seen it in print with its figurative meaning is from the late 19th century. I have two examples to show, the first is from the Geelong Advertiser newspaper, printed on June, 1894:
“Now young man, you keep your shirt on, and don’t be too smart.”
The second example is from the Melbourne Punch newspaper, June 1892, that reads:
“‘Keep your shirt collar on, Gladdy,’ says I.”
- After an elderly woman cut in line, several people became annoyed with her, so I told them to keep their shirts on.
- I know you are excited for the miniature golf course, but cool your jets for a moment, will you? I’ll be ready soon.
- This guy lost his marbles when they got his order wrong, so I tried getting him to simmer down.
Note: The origins of many popular sayings and expressions cannot be said with 100% certainty. So what’s provided on a saying’s page are theories that talk about how it might have originated. If not that, then the earliest known recording (that I could find) of the phrase in print will typically be included.