vengeance
n.-
1 the act of revenge (n.) C1 Advanced Literarypunishment or harm given to someone in return for a wrong they did to you.
the act of exacting punishment or retribution for a perceived injury or wrong. Uncountable in its abstract sense, though countable when referring to specific acts.
ExampleThe hero in the movie swore to seek vengeance against the people who destroyed his home.
ExampleThe protagonist's quest for vengeance consumed him entirely, leading to a cycle of violence that ultimately left both families in ruin.
UsageOften used with the verbs 'seek', 'exact', or 'wreak'.
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2 with a vengeance (n.) C1 Advanced Informalused to say that something happens with much more force or energy than before.
used in the idiomatic phrase 'with a vengeance' to indicate a high degree of intensity, force, or violence.
ExampleAfter a week of sunshine, the rain returned with a vengeance.
ExampleThe flu returned to the city with a vengeance, affecting twice as many people as the previous winter's outbreak.
UsageThis sense is almost exclusively found in the fixed prepositional phrase 'with a vengeance'.
From Anglo-Norman vengeaunce, from Old French vengeance, venjance, from vengier (“to avenge”). Analysable as venge + -ance.