English dictionary
instigator
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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someone who deliberately foments trouble
ExamplesShe was the instigator of their quarrel.
Source: WordNet 3.0
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a person who initiates a course of action
Synonyms initiatorSource: WordNet 3.0
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One who instigates or incites.
Source: webster1913