Blood-feud

feud1 (def 1).
Historical Examples

The Unity of Civilization Various
Theodoric the Goth Thomas Hodgkin
The Story of Norway Hjalmar H. Boyesen
Heart of the Blue Ridge Waldron Baily
Myth, Ritual, and Religion, Vol. 1 Andrew Lang
Myth, Ritual, and Religion, Vol. 1 Andrew Lang
Our Home in the Silver West Gordon Stables
Dariel R. D. Blackmore
The Roman and the Teuton Charles Kingsley
Myth, Ritual And Religion, Vol. 2 (of 2) Andrew Lang

noun
a feud in which the members of hostile families or clans murder each other

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