Tra từ tighten up on something - Từ điển Oxford Advanced Learner 8th

Từ điển Oxford Advanced Learner 8th

tighten up on something ˌtighten ˈup (on sth) derived to become stricter or more careful •Laws on gambling have tightened up recently. •The police are tightening up on under-age drinking. Main entry: ↑tighten_derived