Definition of "feud"

A state of long-standing mutual hostility.  examples

(professional wrestling) A staged rivalry between wrestlers.  examples

(obsolete) A combination of kindred to avenge injuries or affronts, done or offered to any of their blood, on the offender and all his race.

(intransitive) To carry on a feud.  examples

An estate granted to a vassal by a feudal lord in exchange for service.  examples