Sip

verb (used with object), sipped, sipping.
1.
to drink (a liquid) a little at a time; take small tastes of:
He sipped the hot tea noisily.
2.
to drink from a little at a time:
The bird sipped the flower.
3.
to take in; absorb:
to sip knowledge at its source.
verb (used without object), sipped, sipping.
4.
to drink by sips.
noun
5.
an instance of sipping; a small taste of a liquid:
One sip told me that the milk was sour.
6.
a small quantity taken by sipping:
Take just a sip, not a gulp or a swallow.
1.
supplemental income plan.
verb sips, sipping, sipped
1.
to drink (a liquid) by taking small mouthfuls; drink gingerly or delicately
noun
2.
a small quantity of a liquid taken into the mouth and swallowed
3.
an act of sipping

1. Session Initiation Protocol.
2. Supplementary Ideographic Plane.
(2003-12-26)
SIP
1.
serial interface processor
2.
session initiation protocol
3.
single in-line package
4.
system implementation plan