(as) mute as a fish
Totally silent; not saying a word. I can't believe you sat there, mute as a fish, as the boss criticized me in the middle of the meeting. Thanks for nothing! Oh, so now you're all as mute as a fish, how convenient. Is no one really going to tell me who's responsible for this prank? The boy was wide-eyed and mute as a fish as he watched the barrel explode into flames.
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