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instigator

noun [C]
 
 
/ˈɪn.stɪ.ɡeɪ.tər/ US  /-t̬ɚ/

Definition

a person who causes something to happen, especially something bad: The instigators of the disturbance have not yet been identified.Causing things to happen
(Definition of instigator noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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