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crack down

crack down

 
See:
crack
part of speech: phrase
definition 1: to increase the severity with which rules, laws, or the like are enforced, esp. to combat abuses or rectify a problem.
With so many people ignoring the new speed limit, the police have begun to crack down.
definition 2: to deal with more strictly or harshly in order to enforce rules, laws, or requirements (fol. by "on").
Government forces cracked down on the protesters today.The police in this state have begun to crack down on drivers using their cell phones.The teacher is now cracking down on students handing in their papers late.