keep one's pants on

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keep one's pants on (third-person singular simple present keeps one's pants on, present participle keeping one's pants on, simple past and past participle kept one's pants on)

1. (idiomatic, slang, chiefly imperative) To stay calm.

   All right, okay! Keep your pants on, I'm coming!

• keep one's hair on
• keep one's knickers on

• keep it in one's pants