noun
Baseball term for a pitcher who enters the game to replace the starting pitcher. The Japanese synonym 救援投手 is also used.
See also: 救援投手
チームはリリーフピッチャーを投入した。
The team brought in a relief pitcher.
彼はリリーフピッチャーとして試合を締めくくった。
He closed out the game as a relief pitcher.