Home›Browse›R›round-tripperround-tripperOur editors are putting together more complete content — check back in about 20 minutesround-tripperround-tripper — nounnoun1. a hit in baseball that allows the batter to run around all bases and score1.nounDefinitiona hit in baseball that allows the batter to run around all bases and scoreExampleHe hit a round-tripper in the ninth inning.