Meaning of “master switch” in the English Dictionary

british dictionary

"master switch" in British English

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master switchnoun [ C ]

uk /ˈmɑː.stə ˌswɪtʃ/ us /ˈmæs.tɚ ˌswɪtʃ/

a switch that can be used to turn on or off power to all the lights or machines in a building

(Definition of “master switch” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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