The idiom "let one's hair down" means to relax and be oneself without worrying about social norms or expectations. It is often used when someone is in a formal or professional setting and wants to unwind and have fun.
For example, if you are at a party and you see someone who is usually very reserved and serious, but they start dancing and laughing, you could say that they are letting their hair down.
The origin of this idiom comes from the idea that women used to wear their hair up in elaborate styles, which were considered formal and proper. When they let their hair down, it was a sign that they were relaxed and informal.
So, if you want to use this idiom in a sentence, you could say something like, "I'm so glad we're finally done with work for the week. Let's go out and let our hair down!" This would mean that you want to relax and have fun without worrying about work or other responsibilities.
• The CEO finally let his hair down and showed his playful side during the company's team-building retreat.
• I can't wait to let my hair down and relax on the beach during my vacation.
• She's always so serious at work, but when she's with her friends, she really lets her hair down.
• We decided to let our hair down and go on a spontaneous road trip.
• After a long day of work, I like to let my hair down by watching TV.
• I'm going to let my hair down and dance at the party tonight.
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