終しゅう宵しょう

noun

all night long; throughout the night

Literary or formal noun meaning the entire night. In modern Japanese, 一晩中 (ひとばんじゅう) or 夜通し (よどおし) are more common.

• 終しゅう宵しょう、雨あめが降ふり続つづいた。

  It rained all night long.