日に日に

• 読み: ひにひに
• ローマ字: hinihini
• 漢字の分解: 日 (hi/nichi) — day, sun
• 発音: /hi.ni.hi.ni/

意味

Day by day; with each passing day. Describes a gradual, ongoing change that accumulates over time.

An adverb indicating continuous, incremental change: 日に日に寒くなる (getting colder day by day), 日に日に回復する (recovering day by day). Always implies a progressive trend — something visibly changing as each day passes. Can describe both positive developments (growth, improvement) and negative ones (decline, worsening). More vivid and emphatic than だんだん (dandan, gradually), as it foregrounds the daily accumulation of change.

例文

1. 春が近づき日に日に暖かくなってきた。
2. 赤ちゃんが日に日に大きくなっている。
3. 祖母の体調が日に日に悪化していった。

使い方ガイド

場面: seasons, health, growth

トーン: observational

起源と歴史

A repetitive construction using 日 (hi, day) + に (ni, by/with) + 日 (hi) + に (ni). Literally 'day upon day' — each repetition emphasises the accumulation of daily increments. This pattern of repeating a time word for emphasis is a classical Japanese structure.

文化的背景

時代: Ancient

世代: All ages

社会的背景: Universal