[] tighten sth (up)to make sth become stricter; to increase control over sth使更加严格；加强◆The government is to tighten the rules on drug advertising.政府将制订更加严格的药品广告管理规定。⨁to tighten policy / regulations / rules / security使政策更严格；严格规章制度；加强安全措施▸ˈtightening
noun
[; ](a) tightening (up) of sth◆a tightening of safety standards严格安全标准●tighten your ˈbeltto spend less money because there is less available勒紧腰带（省吃俭用）◆With price increases on most goods, everyone is having to tighten their belt.随着大多数商品的价格上涨，每个人都不得不勒紧腰带。➡belt-tightening ➡ idiom at purse ●ˌtighten ˈup (on sth)to become stricter or more careful变得更加严格（或小心）◆steps to tighten up on tax evasion对避税严加管理的措施