keep one's knickers on

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

1. (idiomatic, slang, chiefly imperative) To stay calm; to not get flustered or angry.

   Keep your knickers on, mate. It was only a joke.

• keep one's hair on
• keep one's pants on

• get one's knickers in a twist