pinch runner
US /ˈpɪntʃ ˌrʌn.ər/
UK /ˈpɪntʃ ˌrʌn.ər/

1.
代跑, 替跑员
a baseball player who is substituted for another player on base, usually to provide more speed on the basepaths
:
•
The coach sent in a pinch runner to steal second base.
教练派上代跑去盗二垒。
•
The veteran catcher was replaced by a speedy pinch runner.
这位经验丰富的捕手被一名速度快的代跑替换了。