clipping of sister
a person's sister (often used as a form of address)
"where are you going, sis?"
used to express disappointment, disgust, or contempt
"sis—the floor is dirty!"
A colloquial abbreviation of Sister.
Six. See Sise.
a specialist regiment of the British army that is trained in commando techniques of warfare and used in clandestine operations (especially against terrorist groups)
a female person who has the same parents as another person;
"my sister married a musician"