Definition of switch noun from the Oxford Advanced American Dictionary

      

    switch

     noun
    noun
    NAmE//swɪtʃ//
     
     
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  1. 1a small device that you press or move up and down in order to turn a light or piece of electrical equipment on and off a light switch an on-off switch That was in the days before electricity was available at the flick of a switch. Which switch do I press to turn it off? to throw a switch (= to move a large switch)
  2. 2a change from one thing to another, especially when this is sudden and complete switch (in/of something) a switch of priorities switch (from A to B) She made the switch from full-time to part-time work when her first child was born. a policy switch
  3. 3 the piece of track at a place where a railroad line divides that can be moved to allow a train to change tracks
  4. 4a thin stick that bends easily a riding switch
See the Oxford Advanced Learner's Dictionary entry: switch