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stir1. 1  to move one's hand or an implement continuously or repeatedly through (a liquid or other substance) in order to cool, mix, agitate, dissolve, etc., any or all of the component parts: to stir one's coffee with a spoon. 2  to set in tremulous, fluttering, or irregular motion: A soft breeze stirred the leaves.
stirring. 1  1 : to make or cause to make a usually slight movement or change of position She heard the child stir in bed. The breeze stirred the tree's leaves. 2  2 : to make active A good book can stir the imagination. 3  3 : to mix, dissolve, or move about by making a circular movement in He stirred sugar into his coffee.