Stepsisters are girls who share no blood but are related because their parents married each other. They live as part of the same family after the marriage.
My stepsisters live in another city.
She invited her stepsisters to the party.
In stories, stepsisters often mean sisters who are not kind and cause problems. They usually appear in fairy tales and movies.
The stepsisters were cruel in the story.
She acted like one of the stepsisters in that tale.
Sometimes people use 'stepsisters' as a funny way to talk about women who do not get along well. It is not a formal meaning and is used in jokes or stories.
The two stepsisters competed for attention.
She joked that her colleagues were like stepsisters.
Sometimes 'Stepsisters' is used as a name for bands, teams, or fictional groups in shows or books. It is a proper noun in these cases.
Stepsisters released a new music album.
The Stepsisters are popular on television.
Some use 'stepsisters' informally to mean close female friends who are not real sisters but share a strong bond.
We are like stepsisters in this city.
They called each other stepsisters at school.