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switch

noun (DEVICE)
 
 
/swɪtʃ/

Definition

B1 [C] a small device, usually pushed up or down with your finger, that controls and turns on or off an electric current: a light switch Can you flip the switch?Electrical switches and connections switches [plural] US for pointsElectrical switches and connections
(Definition of switch noun (DEVICE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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