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

crack down

phrasal verb
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crack down (on somebody/something)
  1. 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.
    • to crack down hard on crime
    related noun crackdown
See crack down in the Oxford Advanced American Dictionary
perfectly
adverb
 
 
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