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by buck84
Originally posted by Captain Cold Nose View Post
If Mathewson was using the phrase In a pinch, it undoubtedly was well set in the common vernacular. I've always taken pinch hitter like that, a hitter who is brought up in a pinch, a potentially testy situation that calls for special effort.
I can confirm this. Pitching In A Pinch serves as a guide to what was then contemporary baseball. In his book, Matty describes the slang and going-ons to the reader. On page 54 of my version (published by Forgotten Books):
"In most Big League ball games, there comes an inning on which hangs victory or defeat. Certain intellectual fans call it the crisis; college professors, interested in the sport, have named it the psychological moment; Big League managers mention it as the "break," and pitchers speak of the "pinch." "
Thus, as you and the OP deduced, the term eventually extended to any moment that hangs in the balance. A "pinch" hitter was at one time the equivalent to the modern "clutch" hitter, or one who arrived in a situation on which hung victory or defeat, as Matty put it. Because pitchers generally went the whole game, you only substituted for them if you really needed a better bat to get you ahead. The substitute was more likely to arrive in a situation that warranted a RBI in a close game, or the "pinches." Otherwise, you let the pitcher do his thing. Even guys who got shelled lasted a lot longer than we'd expect today because of the limited pitching staff.
Somewhere along the line, the term must've been gradually minimized to describe anyone approaching the plate in place of another in order to further the game. Instead of "substitute," he became the "pinch hitter" regardless of the situation.