pinch runner
US /ˈpɪntʃ ˌrʌn.ər/
UK /ˈpɪntʃ ˌrʌn.ər/
1.
a baseball player who is substituted for another player on base, usually to provide more speed on the basepaths
:
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The coach sent in a pinch runner to steal second base.
•
The veteran catcher was replaced by a speedy pinch runner.