Clam up

Meaning: stop talking , so that you don't say something you don't want others to know. It can be issued as an order to someone else. (see zip your lip)
Example: When the police arrested the man and they read him his rights he clammed up and wouldn't say anything else. When his partner started to talk the man told him to clam up and zip his lip.
See this Idiom in a story: In the Middle of a Test

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