noun, noun or participle which takes 'suru', intransitive verb
staying one night; one night's lodging
Refers to the act of staying overnight at a place, often used in the context of travel or temporary lodging. Can be used as a noun or with する to mean 'to stay one night'.
旅の途中で、小さな宿に一宿した。
During the journey, I stayed one night at a small inn.
一宿の恩を忘れない。
I won't forget the kindness of that one night's lodging.