1. Cool Your Jets Now

: 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

: 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 1. Cool Your Jets

: Specifically used when someone's anger is "boiling over". Keep your shirt on : An older idiom for staying calm. Pop Culture Connections : While it started in futuristic science fiction,

: 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."). Keep your shirt on : An older idiom for staying calm

: A classic alternative for advising patience.

: 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!".