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keep quiet

Also, keep still.

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1

Also, be quiet or still. Remain silent; same as hold one's tongue. For example, Please keep quiet about the party. Also see keep one's mouth shut.

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2

Refrain from moving, stay in the same position; same as hold still. For example, The doctor gave the young boy a toy to keep him quiet while on the examining table, or It's hard for the baby to keep still unless he's sleeping. [Late 1300s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.