Definition of crackdown noun from the Oxford Advanced Learner's Dictionary

 

crackdown

 noun
noun
BrE BrE//ˈkrækdaʊn//
 
; NAmE NAmE//ˈkrækdaʊn//
 
 
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crackdown (on somebody/something) severe action taken to restrict the activities of criminals or of people opposed to the government or somebody in authority a military crackdown on student protesters a crackdown on crime The government has ordered a crackdown on truancy. They’re having a crackdown on private phone calls from the office.
See the Oxford Advanced American Dictionary entry: crackdown