Quite simply — who coined the phrase "to coin a phrase"?
I'm sure it wasn't one person, but it's the origin that is of interest.
closed as general reference by Matt E. Эллен♦, J.R., Mitch, kiamlaluno, Mark Beadles May 18 '12 at 13:58
This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information. If this question can be reworded to fit the rules in the help center, please edit the question.