Stir1  —v. (-rr-) 1  move a spoon etc. Round and round in (a liquid etc.), esp. To mix ingredients. 2 a cause to move, esp. Slightly. B be or begin to be in motion. 3 rise from sleep. 4 arouse, inspire, or excite (the emotions, a person, etc.). 5 colloq. Cause trouble between people by gossiping etc. —n. 1 act of stirring. 2 commotion, excitement.  stir in add (an ingredient) by stirring. Stir up 1 mix thoroughly by stirring. 2 stimulate, excite.  stirrer n. [old english]