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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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. On the one hand, the observation is so obvious that the only real reaction one can make is to mutter ruefully over how a certified big brain like Posner can turn any p banal opinion into a book deal.
CUTLINE: Baltimore pitcher Kevin Millwood reaches down for the rosin bag as Boston's David Ortiz rounds the bases after hitting a three-run homer in the fourth inning.
I have the ball in my glove and the rosin bag in my right hand as I get to the circle."