let one's hair down

(verb) to relax; to behave informally.

Letcho hair down, dog!

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let your hair down

going overboard with effort or giving more effort than is required for a simple task

wow you really let your hair down today at noon ball, i think you actually killed a guy

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Downs hair

Hair that tends to stand up on the sides of the head. People with down syndrome usual have this type of hair

Co-worker: yo bud, I noticed your hair always stands up on the sides. You got downs hair.