crack down - definition and synonyms

phrasal verb [intransitive]
present tense
I/you/we/theycrack down
he/she/itcracks down
present participlecracking down
past tensecracked down
past participlecracked down
  1. to start dealing with someone or something much more strictly
    crack down on:

    The school is cracking down on smoking.

See also main entry: crack