1640s, agent noun from agitate (v.); originally "elected representative of the common soldiers in Cromwell's army," who brought grievances (chiefly over lack of pay) to their officers and Parliament.
Political sense is first recorded 1734, and negative overtones began with its association with Irish patriots such as Daniel O'Connell (1775-1847). Historically, in American English, often with outside and referring to people who stir up a supposedly contented class or race. Latin agitator meant "a driver, a charioteer."
1. Mona had watched him grow into an arrogant political agitator.
2. Hitler's just a self - educated street agitator.
希特勒无非是个 自学 出身的街头煽动家罢了.
3. The separator whirred the agitator jarred and crashed.
4. The drive wheel of the world's strongest military machine was grasped by an Austrian street agitator.
5. For satisfactory fluidization under these conditions an agitator is used in the bed.