Quid pro quo

English speakers often use the term to mean "a favor for a favor" and the phrases with almost identical meaning include: "give and take", "tit for tat", "this for that", and "you scratch my back, and I'll scratch yours." Other meanings are given later in this article.

http://en.wikipedia.org/wiki/Quid_pro_quo 3 Sep 2012 PM 20:59