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English definition of “switchboard”

switchboard

noun [C]     /ˈswɪtʃ.bɔːd/ US  /-bɔːrd/
a piece of equipment that is used to direct all the phone calls made to and from a particular building or area: Tearful fans jammed the radio station's switchboard after the singer's death (= so many people called that all the phones were busy).Electrical switches and connectionsTelephone equipment
(Definition of switchboard noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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