名詞 reliever:

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

re.liev.er

n.（名詞）
One that provides relief.
緩解者，救濟者：提供援助者
Baseball A relief pitcher.
【棒球】 救援投手