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switch

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noun [countable] British English pronunciation: switch /swɪtʃ/ 
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singularswitch
pluralswitches
  1. 1
    something such as a button or a key that controls the electrical supply to a light, piece of equipment, machine etc

    a light switch

    an on-off switch

    flick/flip a switch (=push it up or down):

    He flicked the intercom switch to his secretary.

    press a switch:

    Lily pressed the switch and plunged the room into darkness.

  2. 2
    a change from one thing to another

    a major policy switch by Washington

    a switch (from something) to something:

    He said the switch from electric to solar power would be made soon.

    A switch to a high-fibre diet will help your digestion.

    make the switch (from something) to something:

    Last year he made the switch to boxing from kickboxing.

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