Keep your shirt on
Meaning
To tell someone to calm down, be patient, or not get overly excited or angry.
Origin
Picture the dusty saloons and tense street corners of the American West. When arguments escalated, a common precursor to a fistfight was for a man to begin stripping off his outer garments, specifically his shirt, to free his arms for combat and show he meant business. To implore someone to "keep your shirt on" was a direct, literal command to de-escalate, to prevent the situation from boiling over into a physical brawl. This vivid, action-oriented warning against preparing for a fight quickly transcended its violent origins, becoming a universally understood plea for patience and composure, urging anyone on the verge of losing their temper to simply calm down.
Examples
- I know you're eager to open your presents, but keep your shirt on; it's not Christmas morning yet.
- Just keep your shirt on, the manager will be with you in a minute to sort out the problem.