let one’s hair down

(verb) to relax after a stressful period

Example Sentences:

A: Did you have a good time in Cuba?
B: Yeah! I spent time at the beach, I drank a lot of beer, and I really let my hair down.

Melissa spent the weekend letting her hair down by watching TV and drinking green tea.

A: Do you want to go out tonight?
B: No, I had a really stressful day. I think I’m just going to let my hair down by going home and having a bubble bath.

From the News:

How NOT to let your hair down

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