A small mouthful of drink
"She took a quick sip of her coffee before leaving the café."
Usage: As a noun, sip refers to the specific act or quantity of liquid taken in one slow swallow. Use this term when describing individual bites from a beverage rather than referring to the entire container or volume consumed.
To drink slowly, small mouthfuls at a time.
"She paused to sip her coffee while watching the sunset."
In plain English: To sip means to drink a small amount of liquid slowly from a cup or glass.
"She took a sip from her coffee cup before leaving for work."
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.
"The developer had to look up "sip" in a Unicode documentation table because it was the initialism for Supplementary Ideographic Plane, which contains many rare Chinese and Japanese characters."
Inherited from Middle English sippen, of uncertain origin. Compare with Low German sippen ("to sip"). Possibly from a variant of Middle English suppen ("to drink, sip") (see sup) or perhaps from Old English sipian, sypian ("to take in moisture, soak, macerate"), from Proto-Germanic sipōną ("to drip, trickle"), from Proto-Indo-European seyb- ("to pour out, trickle, leak out"). Compare also Old High German supfen ("to drink, sip"), from Proto-Germanic *sūpaną ("to sip, intake").