What does 昼夜 mean?
昼夜 is a Japanese noun meaning “day and night” in English. It is written as 昼夜 in kanji, ちゅうや in hiragana, and chuuya in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
警察が墜落事故の原因を昼夜休むことなく調査している。
The police are investigating the cause of the crash around the clock.