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
kunpunoadahatomonitenwoitadakazu
JMdict entry #2697510
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expressions (phrases, clauses, etc.)
proverb
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
see: 不倶戴天