Definition of crack down phrasal verb from the Oxford Advanced Learner's Dictionary

 

crack down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

crack down

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crack down on somebody

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crack down on something

 
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to try harder to prevent an illegal activity and deal more severely with those who are caught doing it Police are cracking down on drug dealers. related noun crackdown
See the Oxford Advanced American Dictionary entry: crack down