Vocabulary
日夜
にちや
day and night; around the clock; always; constantly
adverb
noun
N1
freq #3
Example sentences
彼（かれ）は日夜（にちや）働（はたら）いて過労（かろう）になった。
He worked day and night and overworked himself.
彼（かれ）は金持（かねも）ちになるために、日夜（にちや）働（はたら）いた。
He worked day and night so that he might become rich.