釋義：

shirt 襯衫，襯衣，字面來看，Keep your shirt on 穿上襯衫的意思；

In English, To keep calm. 在英文里，是保持冷靜，別激動的意思； If we find ourselves in a heated situation with a person getting riled up, we may try calming the irritated person by using this expression.如果我們發現周圍有人發怒或者生氣了，我們就可以用keep your shirt on去讓他保持冷靜；

來源：

This phrase may originate from the fact that when people get angry and are looking to fight, they'll sometimes remove their shirt.

這個俚語的來源是這樣子，當人們很生氣，準備打架的時候，他們就會脫掉自己的襯衣。

Why? Because removing one's shirt increases maneuverability；

為什么呢，因為脫掉衣服就可以增加靈活性。

it allows for further range of motion of the upper body that would otherwise be limited.

這樣打架時上肢的運動就會更加自如；

Therefore, those who were not interested in fighting would advise an angered person to literally keep their shirt on, showing they wanted to settle things through peaceful means rather than through violence.

因此，對打架不是很感興趣的人就會建議打架者穿上衣服，以此暗示他們希望打架者通過和平而不是暴力的形式來解決問題。

舉例：

1.你和朋友去趕車，朋友的時間計算錯了，很著急，你就可以說：

keep your shirt on, we have plenty of time to catch the train.

你別太緊張了，我們還有時間足夠趕到火車。

2.這學期沒好好學習，考試考了59分，老爸很生氣，你說：

Dad, keep your shirt on, please! I'll study hard next term.爸爸，千萬不要發火，我下學期一定努力學習。