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English definition of “master switch”

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master switch

noun [C] uk   us  
a switch that can be used to turn on or off power to all the lights or machines in a building
Translations of “master switch”
in Chinese (Traditional) 主控開關,總開關…
in Chinese (Simplified) 主控开关,总开关…
(Definition of master switch from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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