1. a severe restriction or harsh enforcement of rules or laws

Examples

• The government announced a clampdown on illegal immigration.
• There was a clampdown on student protests at the university.
• The new clampdown on speeding includes higher fines.
• Police began a clampdown on drug dealers in the neighborhood.
• The company imposed a clampdown on personal internet use during work hours.
• Citizens protested the clampdown on freedom of speech.