Jisho

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くび 寝首
Expressions (phrases, clauses, etc.), Godan verb with 'ku' ending
1. to cut off the head of a sleeping person; to assassinate someone while they sleep
  • いつ
  • ねくび寝首を掻かれる
  • 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.
Expressions (phrases, clauses, etc.), Godan verb with 'ku' ending
2. to catch someone off their guard by setting traps
Other forms
寝首を掻く 【ねくびをかく】

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