ok, here is the exact saying that appeared in an American movie.
"we can make sisters for life"
I couldn't find the definition of "make sisters" on the internet.
so, I assumed that "make sisters" likes "make friends"
So, make sisters with somebody=become a sister of somebody
"for life" can mean "for the rest of someone's life"
So, we can make sisters for life=we can become sisters of each other for the rest of our life.
could I be right?
Best Answer
If google serves, the line is from a movie called 'Neighbors 2: Sorority Rising'
A sorority is a society for female students in a university or college, typically for social purposes. They are prominent in the United States (often identified by Greek letters), and are frequently depicted in movies set in American universities as a result.
A sorority is often considered to be a sisterhood of sorts, and as a member of a sorority, it's commonplace to refer to your fellow members as sorority sisters, which is what your movie quote refers to.