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English definition of “clamp down on something/someone”

clamp down on something/someone

verb [T always + adv/prep] phrasal verb with clamp  /klæmp/ us  
to stop or limit an activity or the people doing it, esp. a bad or illegal activity: Stores use electronic devices to clamp down on theft.
(Definition of clamp down on something/someone from the Cambridge Academic Content Dictionary © Cambridge University Press)
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