clamp down

Từ điển WordNet v3.1 - WordNet Dictionary

verb

repress or suppress (something regarded as undesirable)
- The police clamped down on illegal drugs
• Syn:
crack down
• Derivationally related forms:
crackdown (for: crack down), clampdown
• Hypernyms:
restrict, restrain, trammel, limit, bound,
confine, throttle
• Verb Frames:
- Somebody ----s something