日夜

• 読み: にちや
• ローマ字: nichiya
• 漢字の分解: 日 (nichi/hi) — day, sun; 夜 (ya/yoru) — night, evening
• 発音: /ni.tɕi.ja/

意味

Day and night; around the clock; always; constantly; ceaselessly.

A noun and adverb meaning 'day and night' — emphasising continuous, tireless effort or activity. 日夜努力する (to work hard day and night), 日夜研究を続ける (to continue research around the clock). More literary and formal than いつも (itsumo, always) or 毎日 (mainichi, every day). Carries a sense of dedication and perseverance. Common in news, formal writing, and descriptions of sustained effort.

例文

1. 研究者たちは日夜新しい治療法の開発に取り組んでいる。
2. 彼は日夜練習を重ねて大会で優勝した。
3. 日夜変化する市場の動きに注目している。

使い方ガイド

場面: news, formal writing, dedication

トーン: earnest

起源と歴史

From Sino-Japanese: 日 (nichi, day/sun) + 夜 (ya, night). A straightforward compound meaning 'day and night' — used metaphorically for continuous, unceasing activity.

文化的背景

時代: Classical

世代: All ages

社会的背景: Universal