1. Cool Your Jets May 2026

: One of its earliest recorded uses is in the 1952 novel Stand by for Mars! from the Tom Corbett, Space Cadet series, where a character is told, "Cool your jets, space creep!".

The phrase emerged in the during the mid-20th century, a period deeply influenced by rapid developments in aviation and the "Space Age".

: 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 1. Cool Your Jets

: To advise caution when someone is acting impulsively out of enthusiasm (e.g., "Cool your jets, Sarah. Make sure you have the job offer in writing first.").

If "cool your jets" feels too informal or dated, you might use: : One of its earliest recorded uses is

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

or Take a chill pill : Modern, very informal ways to say the same thing. : While it started in futuristic science fiction,

"" is an informal American idiom used to tell someone to calm down , slow down, or stop being so impatient or angry. It suggests that a person should lower their emotional intensity, much like allowing a powerful jet engine to cool off before pushing it again. Origin and History