Definitions
1.NounOne who or that which operates a switch.
2.NounOne who or that which switches, that is, changes in some way."career switcher; Switch to Acme brand razors for a closer shave! For a limited time, we'll pay you to be a switcher!"
3.NounA switchmode power supply.
4.NounA railway locomotive used for shunting (switching).
5.NounThe yardman who operates such an engine, or performs a similar role in a trucking depot.
6.NounSynonym of vision mixer (“device for selecting between video sources”).