JMdict: 2727590

糠に釘 【ぬかにくぎ】

  1. [exp,n] having no effect; waste of effort
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
糠 Rice Bran コウ ぬか
釘 Nail, Tack, Peg テイ, チョウ くぎ