crack_down has definitions from the field of law
1
[ verb ] (law) get serious about enforcing a rule

Examples

"We have to clamp down and get tough on the dissidents"

Related terms

restrict enforce crackdown

2
[ verb ] repress or suppress (something regarded as undesirable)

Synonyms

clamp_down

Examples

"The police clamped down on illegal drugs"

Related terms

restrict

*