1. To cause liquid, substance, or mixture to enter some state by stirring. A noun or pronoun is used between "stir" and "to." He stirred the milk to a steaming froth. You must stir the mixture to a thick, viscous consistency before it is ready to be spread on the cake.

2. To excite, rouse, or provoke someone into some state or condition. A noun or pronoun is used between "stir" and "to." The politician stirred the crowd to a frenzy with her rhetoric. His invigorating words stirred us all to action.