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Definition of Playing in
1. Phrase. (context: baseball) A situation where all 4 infielders line up at least to the grass in front of the infield dirt, in order to be able to make a play at the plate, usually used when the winning run is at third, or when outfielders position themselves closer to the infield, in anticipation of a pop fly. ¹
¹ Source: wiktionary.com