noun, noun or participle which takes 'suru', intransitive verb
being on duty; going on duty
Refers to the state or act of being on duty, especially in contexts like guard duty, military service, or shift work. Often used with する to mean 'to go on duty' or 'to be on duty'.
今夜は私が上番する。
I'll be on duty tonight.
上番中は携帯電話の
Using mobile phones is prohibited while on duty.