Perhaps you know the Hebrew word for to participate - לְהִשְׁתַּתֵּף (le-heesh-tah-TEHF). The root is ש.ת.פ (sh.t.p) - the concept of sharing.
A partner in a financial situation - be it people sharing a house (roommates/house mates), partners in a business venture, or partners in a noble cause (which, inevitably, demands capital) - is a שֻׁתָּף (shoo-TAHF) referring to a male and a שֻׁתָּפָה (shoo-tah-FAH) referring to a female.
Why do I write about this today? Because this past Saturday night, my שותפים (plural for שותף - my roommates - Matan and Ben) and I performed at AACI's Open Mic Night (AACI's שותפים for this event were Nefesh B'Nefesh and RustyMike Radio).
If you missed the performance, here's the official video: