clamp down
phrasal verbclamp down (on somebody/something)
to take strict action in order to prevent something, especially crime 严厉打击(犯罪等) a campaign by police to clamp down on street crime 警方严厉打击街头犯罪的运动 The US government is clamping down on drugs. 美国政府正在取缔毒品。 to clamp down hard on bullying 严厉打击恶霸行为