Question

in_the_loop_122 to not say anything The expression suggests that one keeps one’s mouth as tightly closed as a clamshell.

Accepted Answer

CLAM UP The witness was ready to testify at the trial, but at the last minute she clammed up and wouldn’t say a thing.The boy’s parents were sure he knew something about the theft at school, but when they asked him about it, he clammed up. Conversation

Id	in_the_loop_122
Idiom	CLAM UP
Definition	to not say anything
Examples	The witness was ready to testify at the trial, but at the last minute she clammed up and wouldn’t say a thing. The boy’s parents were sure he knew something about the theft at school, but when they asked him about it, he clammed up.
Extra Info	The expression suggests that one keeps one’s mouth as tightly closed as a clamshell.
Category	Conversation

Clammed Loop Clam Witness Ready Testify Trial Minute