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switch

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1switch/ˈswɪtʃ/noun
pluralswitches
1switch
/ˈswɪtʃ/
noun
pluralswitches
Learner's definition of SWITCH  
[count]
: a small device that starts or stops the flow of electricity to something (such as a lamp or a machine) when it is pressed or moved up and down
— see also dip switchtoggle switch
: a sudden change from one thing to another— usually singular
— see also bait and switch
US : a device for moving the rails of a track so that a train may be turned from one track to another
: a thin stick that can be easily bent
2switch/ˈswɪtʃ/verb
switchesswitchedswitching
2switch
/ˈswɪtʃ/
verb
switchesswitchedswitching
Learner's definition of SWITCH  
: to make a change from one thing to another: to start doing or using something that is different
[no object]
[+ object]
: to make a change from one thing to another by turning or pushing a button or moving a switch, lever, etc.
[no object]
[+ object]
[+ object] : to change or replace (something) with another thing

switch gears

— see 1gear

switch off

[phrasal verb]
switch (something) off or switch off (something) : to turn off (something) by turning or pushing a button or moving a switch, lever, etc.
informal : to stop paying attention

switch on

[phrasal verb]
switch (something) on or switch on (something) 
: to turn on (something) by turning or pushing a button or moving a switch, lever, etc.
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