Definition of switchboard noun from the Oxford Advanced American Dictionary

 

switchboard

 noun
noun
NAmE//ˈswɪtʃbɔrd//
 
 
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the central part of a telephone system used by a company, etc., where telephone calls are answered and put through (= connected) to the appropriate person or department; the people who work this equipment a switchboard operator Call the switchboard and ask for extension 410. Hundreds of fans jammed the switchboard for over an hour.
See the Oxford Advanced Learner's Dictionary entry: switchboard