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keep one's mouth shut

Be quiet; don't reveal confidential information. For example, The teachers told us to keep our mouths shut during the entire presentation, or You can't tell Carol anything; she's incapable of keeping her mouth shut. Also see hold one's tongue.

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having or claiming to have the power of seeing objects or actions beyond the range of natural vision.
mild or merciful in disposition or character; lenient; compassionate.
favorite; cherished.
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Words nearby keep one's mouth shut

keep one's eyes open, keep one's fingers crossed, keep one's hand in, keep one's hands off, keep one's head, keep one's mouth shut, keep one's nose clean, keep one's nose to the grindstone, keep one's own counsel, keep one's powder dry, keep one's shirt on
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.