agitator
noun/ˈædʒɪteɪtə(r)/
/ˈædʒɪteɪtər/
(disapproving)- a person who tries to persuade people to take part in political protest
- a known agitator and troublemaker
Word Originmid 17th cent. (denoting a delegate of private soldiers in the Parliamentary army during the English Civil War): from Latin, from agitare, frequentative of agere ‘do, drive’. The current sense dates from the mid 18th cent.
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agitator