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ground rule double

noun, Baseball.
1.
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
1945-1950
An Americanism dating back to 1945-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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