From Longman Dictionary of Contemporary Englishclampdownclamp‧down /ˈklæmpdaʊn/ noun [countable usually singular] PREVENTsudden firm action that is taken to reduce crimeclampdown on a clampdown on drug dealers
Examples from the Corpus
clampdown• Black opposition leaders are arrested, a press clampdown begins and resistance is strangled.• A massive security clampdown aimed at restoring order resulted in major bloodshed, particularly in the capital, Baku.• In mid-1990, martial law was formally lifted but the security clampdown remains currently in force.• Human rights observers said it was the most swingeing clampdown that the world had known on the free use of cyberspace.• If the military were to seize power under Bourbollon, the clampdown would be fierce.clampdown on• The governor has ordered a clampdown on illegal immigration.From Longman Business Dictionaryclampdownclamp‧down /ˈklæmpdaʊn/ noun [countable usually singular] sudden action in order to stop something from happening or control it much more strictlyThe UK government is launching a clampdown on internet casino advertisements. 