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English definition of “crack”

crack

verb (MAKE SOUND)    /kræk/
[I or T] to make a sudden, short noise, or to cause something to make this noise: The whip cracked over the horses' heads. He's always cracking his knuckles (= pulling the joints of his fingers to make a noise).Sounds made by objects, movement or impact [I] If a voice cracks, its sound changes because the person is upset: Her voice cracked with emotion as she told the story.Becoming and making less strong
(Definition of crack verb (MAKE SOUND) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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