night watch; night guard duty
Refers to the act of keeping watch or being on guard duty at night, or the person performing that duty.
He is on night watch duty tonight.
The night watch security guard is patrolling.
Compound of 夜 (yo, 'night') and 詰め (zume, from 詰める tsumeru, 'to be on duty' or 'to stay at a post'). The reading よづめ reflects rendaku voicing of つめ to づめ.