制(せい)するto hold back (e.g. emotions), to rein in (e.g. a horse, unruly people), to bridle, to get the better of, to control, to command

法(ほう)を制(せい)するのは政治(せいじ)家(か)の役目(やくめ)である。

The role of politicians is to control the law. {to hold back (e.g. emotions), to rein in (e.g. a horse, unruly people), to bridle, to get the better of, to control, to command}

警察官(けいさつかん)たちが殺到(さっとう)する群衆(ぐんしゅう)を制(せい)しています。

The police officers are controlling the rushing crowd. {to hold back (e.g. emotions), to rein in (e.g. a horse, unruly people), to bridle, to get the better of, to control, to command}

過半数(かはんすう)の賛成(さんせい)を制(せい)した法案(ほうあん)が可決(かけつ)されたそうです。

It seems that the bill which gained more than half of the approval was passed. {to hold back (e.g. emotions), to rein in (e.g. a horse, unruly people), to bridle, to get the better of, to control, to command}

天皇(てんのう)は律令(りつりょう)を制(せい)することで中央(ちゅうおう)集権(しゅうけん)的(てき)な国家(こっか)体制(たいせい)を築(きず)いた。

The Emperor established a centralized national system by controlling the legal codes. {to hold back (e.g. emotions), to rein in (e.g. a horse, unruly people), to bridle, to get the better of, to control, to command}

子供(こども)ならいざ知(し)らず、大人(おとな)なら感情(かんじょう)を制(せい)することができて然(しか)るべきだ。

It's understandable for children, but adults should be able to control their emotions. {to hold back (e.g. emotions), to rein in (e.g. a horse, unruly people), to bridle, to get the better of, to control, to command}