The Collaborative International Dictionary of English v.0.48:
Sip \Sip\ (s[i^]p), v. t. [imp. & p. p. Sipped (s[i^]pt); p.
pr. & vb. n. Sipping.] [OE. sippen; akin to OD. sippen, and
AS. s?pan to sip, suck up, drink. See Sup, v. t.]
1. To drink or imbibe in small quantities; especially, to
take in with the lips in small quantities, as a liquid;
as, to sip tea. "Every herb that sips the dew." --Milton.
2. To draw into the mouth; to suck up; as, a bee sips nectar
from the flowers.
3. To taste the liquor of; to drink out of. [Poetic]
They skim the floods, and sip the purple flowers.