let yourself go
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1. To stop physically holding on to someone or something. In this usage, a noun or pronoun can be used between "let" and "go." If you let go of the ledge, you'll fall!
2. To fire or dismiss an employee. In this usage, a noun or pronoun can be used between "let" and "go." I'm worried that they'll let me go once this special project is over.
3. To release someone or something from one's custody. In this usage, a noun or pronoun can be used between "let" and "go." We did bring him in for questioning, but he claimed to have no knowledge of the incident, so we had to let him go.
4. To accept something as it is. In this usage, the phrase is often "let it go." He's never going to clean the kitchen as diligently as you would—just let it go.
5. To make noise in a sudden, fierce, and/or uncontrolled manner. The trapped wolf let go with a bone-chilling howl.
6. To launch into a verbal attack or reprimand. I don't know what made him so angry, but he suddenly let go with a string of expletives.
7. To behave in a wild or uninhibited manner. In this usage, a reflexive pronoun is used between "let" and "go." I was surprised that she let herself go at the party—she's usually so shy and reserved.
8. To fail to maintain an attractive physical appearance. In this usage, a reflexive pronoun is used between "let" and "go." A: "I was surprised to see that he had gained so much weight." B: "I know, he really let himself go after his wife died."
let yourself go1 act in an unrestrained or uninhibited way. 2 neglect yourself or your appearance; become careless or untidy in your habits.
ˌlet yourself ˈgo
1 behave in a relaxed way without worrying about what people think of your behaviour: Come on, enjoy yourself, let yourself go!
2 stop being careful about how you look and dress, etc: He has let himself go since he lost his job.