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Not verbalizing; silent.
(adjective)
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Used as a command to stop speaking.
(interjection)
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Mum's the word Say nothing of the secret you know: Mum's the word on the surprise party.
(idiom)
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To act or play in a pantomime.
(verb-intransitive)
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To go merrymaking in a mask or disguise especially during a festival.
(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.