the central part of a phone system used by a company, etc., where phone calls are answered and put through(= connected) to the appropriate person or department; the people who work this equipment（电话的）交换机，交换台，总机
a switchboard operator交换台接线员
Call the switchboard and ask for extension 410.你先打电话到总机，然后要求转分机 410。🔊🔊
Hundreds of fans jammed the switchboard for over an hour.在一个多小时里，好几百个崇拜者打去电话，交换台应接不暇。🔊🔊
The BBC switchboard was jammed with furious calls.英国广播公司总机被愤怒的投诉电话弄得应接不暇。