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To break or snap apart.
(verb-intransitive)
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To make a sharp snapping sound.
(verb-intransitive)
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To break without complete separation of parts; fissure: The mirror cracked.
(verb-intransitive)
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To change sharply in pitch or timbre, as from hoarseness or emotion. Used of the voice.
(verb-intransitive)
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To break down; fail: The defendant's composure finally began to crack.
(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.