noun
A noun meaning a single night or the duration of one night. Often used in contexts like staying overnight or something lasting through the night. The suffix さ adds a sense of extent or duration, similar to 一晩, but with a slightly more colloquial or dialectal feel.
See also: 一夜
彼は一夜さの宿を探した。
He looked for a place to stay for one night.
一夜さのうちに雪が積もった。
Snow piled up in the course of one night.
Derived from 一夜 (ひとよ, 'one night') with the suffix さ, which can indicate extent or degree. The exact origin of the suffix in this context is uncertain, but it may be related to dialectal or colloquial usage.