[swich-bawrd, -bohrd]
noun Electricity.
a structural unit on which are mounted switches and instruments necessary to complete telephone circuits manually.
Also called lightboard. a panel of switches, dimmers, etc., for controlling the lighting on a stage or in an auditorium.

1870–75, Americanism; switch + board

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World English Dictionary
switchboard (ˈswɪtʃˌbɔːd)
1.  an installation in a telephone exchange, office, hotel, etc, at which the interconnection of telephone lines is manually controlled
2.  an assembly of switchgear for the control of power supplies in an installation or building

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Example sentences
The jobs lost will be low-paying ones, such as bank tellers and switchboard
The switchboard operator routed her call to the hotel's security dispatcher.
The hospital switchboard, following orders, declined.
However, taps through the large switchboard at a newspaper or a government
  agency were not feasible, and were not installed.
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