/ venˈdetə; NAmE / noun
1.
a long and violent disagreement between two families or groups, in which people are murdered in return for previous murders
SYN feud
2.
vendetta (against sb) a long argument or disagreement in which one person or group does or says things to harm another :
He has accused the media of pursuing a vendetta against him.
She conducted a personal vendetta against me.
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WORD ORIGIN
mid 19th cent.: from Italian , from Latin vindicta vengeance.