From The Collaborative International Dictionary of English v.0.48:
Sip \Sip\, v. i. To drink a small quantity; to take a fluid with the lips; to take a sip or sips of something. [1913 Webster]
[She] raised it to her mouth with sober grace; Then, sipping, offered to the next in place. --Dryden. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Sip \Sip\, n. 1. The act of sipping; the taking of a liquid with the lips. [1913 Webster]
2. A small draught taken with the lips; a slight taste. [1913 Webster]
One sip of this Will bathe the drooping spirits in delight Beyond the bliss of dreams. --Milton. [1913 Webster]
A sip is all that the public ever care to take from reservoirs of abstract philosophy. --De Quincey. [1913 Webster]
From 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. [1913 Webster]
2. To draw into the mouth; to suck up; as, a bee sips nectar from the flowers. [1913 Webster]
3. To taste the liquor of; to drink out of. [Poetic] [1913 Webster]
They skim the floods, and sip the purple flowers. --Dryden. [1913 Webster]