sis

name

1. (British, abbreviation, alt-of, initialism)Initialism of Secret Intelligence Service.
2. (abbreviation, alt-of, initialism)Initialism of Schengen Information System.

noun

1. (abbreviation, alt-of, initialism)Initialism of second impact syndrome.
2. (abbreviation, alt-of, initialism)Initialism of snow immersion suffocation.
3. (abbreviation, alt-of, initialism)Initialism of student information system.
4. (abbreviation, alt-of, initialism)Initialism of supervised injection site.
5. (abbreviation, acronym, alt-of)Acronym of share-in-savings.
6. (abbreviation, alt-of, clipping, informal)Clipping of sister.

   “big sis”

   “My sis is tying the knot. I want you to play for the reception.”

   “Call me when ur 3 year old daughter knows SZA lyrics, girl said “you still playin the pick me, I’m still playin the victim” we don’t care if it’s backwards sis learned that all on her own 🥹”

7. (form-of, plural)plural of SI