Shifter

Part of speech: noun (n.)

1. One who, or that which, shifts; one who plays tricks or practices artifice; a cozener. 'T was such a shifter that, if truth were known, Death was half glad when he had got him down. Milton.

2. An assistant to the ship's cook in washing, steeping, and shifting the salt provisions.

3. An arrangement for shifting a belt sidewise from one pulley to another.