The Oxford Thesaurus An A-Z Dictionary of Synonyms - sip v.

1) taste, sample, sup: She was sitting on a bar stool, sipping a cocktail. --n. 2) taste, sample, soup‡on, drop, bit, swallow, mouthful, spoonful, thimbleful, nip, dram, Colloq swig: She took a sip, savoured it, then turned to me with a smile.