noun
plural switches
[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
a sudden change from one thing to another - usually singular
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
verb
switches; switched; switching
to make a change from one thing to another :to start doing or using something that is different [no obj]
to make a change from one thing to another by turning or pushing a button or moving a switch, lever, etc. [no obj]
[+ obj] :to change or replace (something) with another thing
switch gears
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.