keep a cool head

keep one's pants on

To stay calm.

keep one's hair on

To stay calm; to be patient; to calm down.

keep one's knickers on

To stay calm; to not get flustered or angry.

cool head

A calm, focused demeanor and mindset; a person having such characteris…

keep one's cool

To remain composed, calm, and even-tempered, especially in a provocati…

keep one's head

To remain calm, reasonable, level-headed, especially in a situation li…