JMdict: 1335020

十年一日 【じゅうねんいちじつ】

  1. [n] without intermission for ten (long) years; with constancy of purpose for ten (long) years; in the same old rut for years on end
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
Ten ジュウ, ジッ, ジュッ とお, と
Year, Counter For Years ネン とし
One, One Radical (no.1) イチ, イツ ひと-, ひと.つ
Day, Sun, Japan, Counter For Days ニチ, ジツ ひ, -び, -か