reliever

Something which relieves (pain, etc.).

Pepto-Bismol is an upset-stomach reliever.

A relief pitcher.

The first reliever got the last two outs of the sixth.

Someone who fills in for another.

I'll be the reliever today so that you can each take a break.

A garment kept for being lent out.

Now that fellow wants five or ten dollars on his suit. He goes to this pawn shop and asks for a reliever. That is a second-hand suit, pretty well used up.