American English

Definition of crack down phrasal verb from the Oxford Advanced American Dictionary

 

crack down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

crack down (on somebody/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 Learner's Dictionary entry: crack down