agitator

(aji tāt′ər)

noun

  1. a person who tries to stir up people in support of a cause: often used in an unfavorable sense
  2. an apparatus for shaking or stirring, as in a washing machine

See agitator in American Heritage Dictionary 4

noun
  1. One who agitates, especially one who engages in political agitation.
  2. An apparatus that shakes or stirs, as in a washing machine.

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