断ことわりを入いれる

expression, ichidan verb

inform in advance; give notice; ask permission beforehand

Used when you notify someone or seek their consent before taking an action. Often implies politeness or consideration. The cross-reference to 断る (sense 2) suggests a connection to declining or giving notice, but here the focus is on prior notification or asking permission.

See also: 断る

• 会かい議ぎを欠けっ席せきするときは、事じ前ぜんに上じょう司しに断ことわりを入いれてください。

  When you will be absent from a meeting, please inform your boss in advance.

• 彼かれは隣となりの家いえに断ことわりを入いれてから木きを切きった。

  He cut the tree after asking permission from the neighbor.