君父の讐は倶に天を戴かず
  くんぷのあだはともにてんをいただかず
  Expressions (phrases, clauses, etc.)
  see: 不倶戴天
  [from the Book of Rites]
  not wanting to live in the same world as one's father's or lord's enemies
  being prepared to sacrifice one's life to avenge one's father or lord
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