1. a series of severe measures to restrict or discourage undesirable or illegal people or behavior

Examples

• The government announced a crackdown on tax evasion.
• Police launched a crackdown on drunk driving during the holidays.
• The school’s crackdown on cheating resulted in several suspensions.
• There has been a crackdown on illegal immigration at the border.
• The company’s crackdown on tardiness improved punctuality.
• City officials ordered a crackdown on street vendors without permits.