Longman Dictionary of Contemporary English homepage

crackdown

 noun
     
crack‧down [countable usually singular]
action that is taken to deal more strictly with crime, a problem, protests etc
crackdown on/against
a military crackdown on pro-democracy demonstrations
the government's crackdown against drugs

➔ crack down

at crack1
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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