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

 

clamp down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

clamp down

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clamp down on somebody

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clamp down on 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 US government is clamping down on drugs. related noun clampdown
See the Oxford Advanced American Dictionary entry: clamp down