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not open one's mouth

shut one's mouth
not say or utter a word
. Be silent, repress one's feelings or opinions, keep a secret. For example,
Don't worry, I'm not going to open my mouth on this issue
, or
She promised not to say a word about it to anyone
The American HeritageĀ® Idioms Dictionary
Copyright Ā© 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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