sip (v.) Look up sip at Dictionary.com
late 14c., of uncertain origin, perhaps from a source related to Low German sippen "to sip," or from Old English sypian "absorb, drink in," related to supan "to take into the mouth a little at a time" (see sup (v.2)). Related: Sipped; sipping.
sip (n.) Look up sip at Dictionary.com
c.1500, from sip (v.).