JMdict: 2423685

腰抜かす 【こしぬかす】

  1. [v5s] to dislocate one's back
  2. [v5s] to be unable to stand up due to fear or surprise; to lose one's legs
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
腰 Loins, Hips, Waist, Low Wainscoting ヨウ こし
抜 Slip Out, Extract, Pull Out, Pilfer, Quote, Remove, Omit バツ, ハツ, ハイ ぬ.く, -ぬ.く, ぬ.き, ぬ.ける, ぬ.かす, ぬ.かる