Definition of switch noun from the Oxford Advanced Learner's Dictionary

Oxford3000

switch

noun
swɪtʃ
 
; swɪtʃ
 
 
1 a small device that you press or move up and down in order to turn a light or piece of electrical equipment on and offa light switchan on-off switchThat 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 a change from one thing to another, especially when this is sudden and completeswitch (in/of something) a switch of prioritiesswitch (from A to B) She made the switch from full-time to part-time work when her first child was born.a policy switch3 (North American English) the points on a railway/railroad line4 a thin stick that bends easilya riding switch