reliever

名词 reliever:

1. someone who takes the place of another (as when things get dangerous or difficult)
   同义词：stand-in, substitute, relief, backup, backup man, fill-in
2. a person who reduces the intensity (e.g., of fears) and calms and pacifies
   同义词：allayer, comforter
3. a pitcher who does not start the game
   同义词：relief pitcher, fireman

re.liev.er

n.（名词）
One that provides relief.
缓解者，救济者：提供援助者
Baseball A relief pitcher.
【棒球】 救援投手