rosin bag

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Noun1.rosin bag - a bag filled with rosin; used by baseball pitchers to improve their grip on the ball
bag - a flexible container with a single opening; "he stuffed his laundry into a large bag"
baseball equipment - equipment used in playing baseball
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References in periodicals archive ?
Sorry, but to me this is too much like saying that major-league pitching has never been the same since Sandy Koufax felt up his last rosin bag.
I have the ball in my glove and the rosin bag in my right hand as I get to the circle.