日にっ夕せき

adverb, noun

day and night; nightfall

Rare literary word. Can refer to the continuous span of day and night, or specifically to the onset of evening. Modern Japanese normally uses 昼夜 for 'day and night' and 日暮れ or 夕暮れ for 'nightfall'.

• 日にっ夕せき、彼かれはその仕し事ごとに打うち込こんだ。

  Day and night, he devoted himself to that work.

• 日にっ夕せきの頃ころ、山やまの端はが赤あかく染そまった。

  Around nightfall, the mountain ridge was dyed red.