1. Cool Your Jets Official

or Take a chill pill : Modern, very informal ways to say the same thing.

: Specifically used when someone's anger is "boiling over". Keep your shirt on : An older idiom for staying calm. Pop Culture Connections 1. Cool Your Jets

: While it started in futuristic science fiction, it gained broader colloquial popularity by the 1970s as a metaphorical way to advise patience or emotional control. When to Use It or Take a chill pill : Modern, very