Real Dictionary

feud
countable noun: A feud is a quarrel in which two people or groups remain angry with each other for a long time, although they are not always fighting or arguing.
verb: If one person or group feuds with another, they have a quarrel that lasts a long time. You can also say that two people or groups feud.

feud in American English 1
a bitter, protracted, and violent quarrel, esp. between clans or families, often characterized by killings and counterkillings
to carry on a feud; quarrel
intransitive verb: to engage in a feud
noun: a bitter, continuous hostility, esp. between two families, clans, etc., often lasting for many years or generations

feud in American English 2
land held from a feudal lord in return for service; fief
noun

feud in British English 1
noun: long and bitter hostility between two families, clans, or individuals; vendetta
verb: to take part in or carry on a feud

feud in British English 2
noun: land held in return for service