Shifter definitions

One who, or that which, shifts or changes.

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

(dated) One who plays tricks or practices artifice; a cozener.

(engineering) An arrangement for shifting a belt sidewise from one pulley to another.

(engineering, textiles) A wire for changing a loop from one needle to another, as in narrowing, etc.

(cycling) A component used by the rider to control the gearing mechanisms and select the desired gear ratio, usually connected to the derailleur by a mechanical actuation cable.

A spanner with an adjustable jaw size.