JMdict: 2787610

腰がぬける 【こしがぬける】

  1. [exp,v1] to be unable to stand; to be weak in the knees; to be paralyzed (e.g. with fear) (paralysed); to be dumbfounded
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
Loins, Hips, Waist, Low Wainscoting ヨウ こし