JMdict: 2118410

寝首をかく 【ねくびをかく】

  1. [exp,v5k] to cut off the head of a sleeping person; to assassinate someone while they sleep
  2. [exp,v5k] to catch someone off their guard by setting traps
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
寝 Lie Down, Sleep, Rest, Bed, Remain Unsold シン ね.る, ね.かす, い.ぬ, みたまや, や.める
首 Neck, Counter For Songs And Poems シュ くび 2