How to say "regulate" in Japanese

• 取り締まるとりしまるJLPT N1approx.Common
  godan verb, transitive verbCovers 'regulate' in the sense of controlling others' behavior by enforcement, like authorities cracking down on violations. The nuance is strict supervision and policing, so it suits regulatory enforcement rather than adjusting systems or machines.
  市しは飲酒運転いんしゅうんてんを非常ひじょうに厳きびしく取り締とりしまって、罰金ばっきんを課かしている。↗

  The city is cracking down on drunk drivers and giving them fines.
• 律するりっする
  suru verb (irregular)Matches 'regulate' chiefly as disciplining oneself or keeping one's own conduct in check. It is a less common, rather formal word; for the broader English sense of regulating machines, markets, or bodily functions it is seldom the word you want.

Use 「取り締まる」 for regulating or cracking down on others' conduct through enforcement, and 「律する」 for disciplining or regulating oneself; both are narrow compared with the broad English 'regulate'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 整えるととのえるto adjust
• 取り締まるとりしまるto crack down on
• 律するりっするto control