Clam up

"Clam up" in a Sentence (2 examples)

Maybe he … or she … was a witness who refused to clam up … a whistle blower …

Teenagers' father. Alright, Matt, I think you've made your point. Matt Foley: Dad, I sincerely wish you'd do everyone a great service, and clam up!

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Unscramble this word: clamup