122 Crack down

(PW) the police are beginning to crack down on teenagers who are out too late at night.

(free)  To act more forcefully to regulate, repress, or restrain

The police cracked down on speeding.

(dictionary)

to take severe or stern measures, esp. in enforcing obedience to laws or regulations:

The police are starting to crack down on local drug dealers.

(MW)

Main Entry: crack down

Function: intransitive verb

Date: 1939

to take positive regulatory or disciplinary action