As I mentioned to Destee, in a class long time ago, I talked a little about Latin phrases that are sometimes used but we dont necessarily know the origins or meanings, such as: Quid pro quo(From theLatinmeaning "what for what"),indicates a more-or-less equal exchange or substitution of goods or services.Englishspeakers often use the term to mean "a favor for a favor" and the phrases with almost identical meaning include: "what for what", "give and take", "this for that", and "you scratch my back, and I'll scratch yours"; or Caveat emptor, "Let the buyer beware".