Definition of "switcher"

switcher

noun
plural switchers
1. One who or that which operates a switch.
  Quotations
  They all love frugality and conservation; they are manic savers of bits of string and switchers-off of lights.
  1984, John Martin Robinson, The latest country houses, page 32
2. One who or that which switches, or changes to something else.
  Quotations
  As a career switcher, I diligently attended all the company presentations on campus, and quickly settled on sales and trading. My prior position was in hospital sales.
  2004, Gabriel Kim, Vault Career Guide to Sales & Trading, page 109
  In short, the task switcher gives you a way to jump directly to another app, without a layover at the Home screen first.
  2011, David Pogue, iPhone: The Missing Manual, page 14
3. (electronics) A switchmode power supply.
4. (rail transport, US) A railway locomotive used for shunting; a shunter.
5. (rail transport, trucking, US) The yardman who operates such an engine, or performs a similar role in a trucking depot: synonym of yard jockey.
6. (television) Synonym of vision mixer (“device for selecting between video sources”)