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To make an abrupt, sharp sound, as in the collision of two hard surfaces.
(verb-intransitive)
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To chatter thoughtlessly or at length.
(verb-intransitive)
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To cackle or cluck, as a hen.
(verb-intransitive)
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To cause to make an abrupt, sharp sound.
(verb-transitive)
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A clacking sound: the clack of an old-fashioned typewriter.
(noun)
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.