Play sister

A play sister is a very good friend or relative who you consider to be just like a sister.

Lisa isn't my biological sister; she is my play sister!

by Norma Jones August 25, 2018

play sister

The undercover love interest of a man who is engaging another woman outside his marriage or relationship. To his wife or girlfriend, this extra girl is a friend, when the truth is he and this "play sister" may have been intimate in the past, but the relationship did not work out.

She's just my play sister - there is nothing up between her and I.

by vandecou December 19, 2012