All 3 Uses

feud
in
The Interlopers
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The neighbour feud had grown into a personal one since Ulrich had come to be head of his family; if there was a man in the world whom he detested and wished ill to it was Georg Znaeym, the inheritor of the quarrel and the tireless game-snatcher and raider of the disputed border-forest.†
*

feud = a bitter, long-standing fight
The feud might, perhaps, have died down or been compromised if the personal ill-will of the two men had not stood in the way; as boys they had thirsted for one another's blood, as men each prayed that misfortune might fall on the other, and this wind-scourged winter night Ulrich had banded together his foresters to watch the dark forest, not in quest of four-footed quarry, but to keep a look-out for the prowling thieves whom he suspected of being afoot from across the land boundary.†
And what peace there would be among the forester folk if we ended our feud to-night.†

Definitions:

(1) (feud)
bitter hostile argument between two parties -- typically long-standing between families or tribes with occasional incidents of violence

Sometimes the term blood feud is used to reference a feud between families.
(2) (meaning too rare to warrant focus)