also: レリーフ
noun, noun or participle which takes 'suru', transitive verb
Refers to a relief pitcher or the act of relieving a pitcher in baseball. Used as a noun or with する to mean 'to come in as a relief pitcher'.
彼はリリーフとしてマウンドに上がった。
He took the mound as a relief pitcher.
エースが打
The ace got hit, so the manager brought in a reliever.