番ばんに当あたる

expression, godan verb (-ru)

have one's turn; be on duty

Used when it is someone's turn to do something, often in a rotating schedule or queue. The phrase implies a sense of responsibility or obligation for that turn.

• 今日きょうは私わたしが掃そう除じの番ばんに当あたっている。

  Today it's my turn to do the cleaning.

• 次つぎは誰だれの番ばんに当あたりますか。

  Whose turn is it next?