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ground rule double

noun, Baseball.
a safe hit ruled for two bases according to the rules of a particular stadium, as when a fly ball bounces once in the outfield and then clears a fence.
Origin of ground rule double
1945-50, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for ground rule double
  • Routine fly ball turns into a ground rule double in the stands.

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