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clamp down

 
See:
clamp
part of speech: phrase
definition 1: (informal) to establish or increase controls or penalties with respect to criminal or disapproved of behaviors.
It's time to clamp down on government corruption.The club owners are clamping down on non-members sneaking in for free.
definition 2: to clasp or grip something very tightly.
The dentist put a flat stick into his mouth and told him to clamp down on it with his teeth.