Meaning of 寝首をかく in Japanese

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寝首 かく

  1. Words

Definition of 寝首をかく

  1. (exp, v5k) to cut off the head of a sleeping person; to assassinate someone while he sleeps

    いつ寝首を掻かれるかわかったものではありません。
    There's no telling when she'll stab you in the back.

  2. to catch someone off his guard by setting traps
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