or Take a chill pill : Modern, very informal ways to say the same thing.
The phrase emerged in the during the mid-20th century, a period deeply influenced by rapid developments in aviation and the "Space Age". 1. Cool Your Jets
: To tell someone to wait when they are rushing a process (e.g., "Cool your jets—the results won't be ready for another hour."). Common Synonyms or Take a chill pill : Modern, very
: Specifically used when someone's anger is "boiling over". Keep your shirt on : An older idiom for staying calm. Pop Culture Connections Common Synonyms : Specifically used when someone's anger
If "cool your jets" feels too informal or dated, you might use:
: A classic alternative for advising patience.
: 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