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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.
vb, stirs, stirring or stirred. 1. (Cookery) to move an implement such as a spoon around in (a liquid) so as to mix up the constituents: she stirred the porridge. 2. to change or cause to change position; disturb or be disturbed: he stirred in his sleep.