止とめに入はいる

expression, godan verb (-ru)

step in to stop; intervene to halt

Used when someone physically or verbally steps into a situation to stop a fight, argument, or ongoing action. Often implies a third party intervening.

• けんかが始はじまったので、先せん生せいが止とめに入はいった。

  When a fight broke out, the teacher stepped in to stop it.

• 彼かれが無む理りな計けい画かくを進すすめようとしたので、同どう僚りょうが止とめに入はいった。

  When he tried to push an unreasonable plan, his colleague intervened to stop him.