日にち夜や

に

ち

や

Common wordJLPTN1Freq.FrequencyTop 50,000

Meanings

Emphasizes continuous effort or activity without pause; often used in contexts of hard work, study, or vigilance.

日にち夜や〈動どう詞し〉to do something day and night / constantly
彼かれは日にち夜や研けん究きゅうに取とり組くんでいる。
He is working on his research day and night.
日にち夜や努ど力りょくするto work hard constantly, day and night
選せん手しゅたちは日にち夜や努ど力りょくを続つづけている。
The athletes keep working hard around the clock.
日にち夜や励はげむto devote oneself diligently day and night
彼かの女じょは日にち夜や勉べん強きょうに励はげんでいる。
She applies herself to her studies day and night.

昼ちゅう夜やN1
昼夜 is a slightly more neutral, noun-like way to say 'day and night', while 日夜 leans adverbial and stresses relentless effort.
四し六ろく時じ中ちゅうN1
四六時中 is colloquial and emphasizes every waking moment, whereas 日夜 is more formal and often used in written contexts about diligence.
絶たえずN2
絶えず means 'constantly, without interruption' in a general sense, while 日夜 specifically evokes continuing through both day and night.
常つねにN3
常に is a broad, neutral 'always', whereas 日夜 carries a stronger nuance of tireless, ongoing effort day and night.

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明あけ暮くれ
日夜 is a more formal, often literary term for 'day and night' or 'constantly', frequently used in set phrases like 日夜努力する, while 明け暮れ carries a softer, more reflective or literary nuance about daily life.
朝あさ晩ばん
日夜 means 'day and night' and is a formal, literary phrase for continuous effort, whereas 朝晩 refers concretely to the morning and evening periods in everyday contexts.

Compound of 日 (day) and 夜 (night), directly expressing the concept of 'day and night'.