agitate (v.) Look up agitate at Dictionary.com
1580s, "to disturb," from Latin agitatus, past participle of agitare "to put in constant or violent motion, drive onward, impel," frequentative of agere "to set in motion, drive, drive forward," figuratively "incite to action; keep in movement, stir up" (see act (n.)).

Literal sense of "move to and fro, shake" is from 1590s. Meaning "to discuss, debate" is from 1640s, that of "keep (a political or social question) constantly im public view" is by 1828. Related: Agitated; agitating.