JMdict: 2827474

万にひとつ 【まんにひとつ】

  1. [exp,adj-no] one in a million (chance, etc.); one in ten thousand; in the unlikely event that
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
万 Ten Thousand, 10,000 マン, バン よろず 2