Jisho

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安全進塁権
Wikipedia definition
1. Ground rule doubleIn baseball, a ground rule double is an award of two bases from the time of pitch to all baserunners including the batter-runner as a result of the ball leaving play after being hit fairly and leaving the field under a condition of the ground rules in effect at the field where the game is being played.
Read “Ground rule double” on English Wikipedia
Read “安全進塁権” on Japanese Wikipedia
Read “Ground rule double” on DBpedia

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