Compounds of 寝首

• 寝首
  (n) head of a sleeping person
• 寝首をかく
  (exp) (1) to cut off the head of a sleeping person
  to assassinate someone while he sleeps
  (2) to catch someone off his guard by setting traps
• 寝首を掻く
  (exp) (1) to cut off the head of a sleeping person
  to assassinate someone while he sleeps
  (2) to catch someone off his guard by setting traps