Etymology
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reliever (n.)

"one who or that which relieves," late 15c., agent noun from relieve. Baseball sense ("relief pitcher," who replaces the starting pitcher when tired or in difficulty) is attested by 1945.

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Definitions of reliever

reliever (n.)
someone who takes the place of another (as when things get dangerous or difficult);
Synonyms: stand-in / substitute / relief / backup / backup man / fill-in
reliever (n.)
a person who reduces the intensity (e.g., of fears) and calms and pacifies;
a reliever of anxiety
Synonyms: allayer / comforter
reliever (n.)
a pitcher who does not start the game;
Synonyms: relief pitcher / fireman
From wordnet.princeton.edu