verb

• (transitive) To drink slowly, small mouthfuls at a time.
  "He held out to me a bowl of steaming broth, that filled the room with a savour sweeter, ten thousand times, to me than every rose and lily of the world; yet would not let me drink it at a gulp, but made me sip it with a spoon like any baby."
• (intransitive) To drink a small quantity.
  "[She] rais'd it to her mouth with sober grace; / Then, sipping, offered to the next in place."
• (Scotland, US, dated) Alternative form of seep.
• (figurative) To consume slowly.
  "Sales of lightbulbs which sip electricity, and whose increased cost in the shops is easily paid for over their lifetime, used to double every year; in 1990/1991, they leapt sevenfold."

noun

• (publishing) Acronym of single-issue publication.

name

• (Internet telephony) Initialism of Session Initiation Protocol
• (computing) Initialism of Supplementary Ideographic Plane, the third plane (Plane 2) in Unicode, with 65,536 codepoints (from U+20000 through U+2FFFF), mainly used for less-common CJK characters.
• (computing, macOS) Initialism of System Integrity Protection.
• (US) Initialism of Strengthening Institutions Program.
  "“The Budget does not include funding for the Strengthening Institutions Program (SIP). SIP is duplicative of other Title III and V program funding for institutional support activities."