Meaning of the word "keep your hair on" in English

What does "keep your hair on" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

keep your hair on

US /kiːp jʊər hɛər ɒn/
UK /kiːp jɔː hɛər ɒn/
"keep your hair on" picture

Idiom

used to tell someone to calm down and not get angry or upset

Example:
Just keep your hair on, there's no need to get so worked up.
Hey, keep your hair on! It was just a joke.