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

 

clamp down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

clamp down (on somebody/something)

 
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to take strict action in order to prevent something, especially crime a campaign by police to clamp down on street crime The U.S. government is clamping down on drugs. related noun clampdown
See the Oxford Advanced Learner's Dictionary entry: clamp down