Definition of avenge verb from the Oxford Advanced American Dictionary

 

avenge

 verb
verb
NAmE//əˈvɛndʒ//
 
(formal)Verb Forms present simple I / you / we / they avenge
 
he / she / it avenges
 
past simple avenged
 
-ing form avenging
 
 
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to punish or hurt someone in return for something bad or wrong that they have done to you, your family, or your friends avenge something He promised to avenge his father's murder. avenge yourself on somebody She was determined to avenge herself on the man who had betrayed her.
avengernoun
 
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Grammaravenge / revengeAvenge is a verb;revenge is (usually) a noun.People avenge something, or avenge themselves on someone:She vowed to avenge her brother’s death. He later avenged himself on his wife’s killers.You take revenge on a person.In literary or old-fashioned English, revenge can also be a verb. People revenge themselves on someone or are revenged on them (with the same meaning):He was later revenged on his wife’s killers.You cannot revenge something:She vowed to revenge her brother’s death.
See the Oxford Advanced Learner's Dictionary entry: avenge