Definitions

1. noun

A female sibling or a sister.

“She was a good sis and helped me with my homework.”

2. noun

A female person who has the same parents as another person or is the daughter of the same parents as another person.

“My sis is going to the same school as me.”

3. abbreviation

Sister-in-law.

“My sis is coming to visit us for the weekend.”

4. interjection

An expression of surprise or excitement.

“Sis! That’s amazing news!”

5. verb

To make a hissing sound, especially in a manner similar to the sound a snake makes.

“The snake hissed at us, and we hissed back, saying sis.”