crack down to become more strict in dealing with a problem and punishing the people involved严厉打击; 制裁; 镇压:[+ on ]•The government is determined to crack down on terrorism.这个政府决心打击恐怖主义。•The police are cracking down hard on violent crime.警方正在严厉打击暴力犯罪活动。⇒CRACKDOWN |