noun
ADJECTIVE
▪ telephone
VERB + SWITCHBOARD
▪ call , ring ( BrE )
▪ flood , jam
▪
The ~ was jammed with furious calls.
▪ be on , man , work on
SWITCHBOARD + VERB
▪ light up
SWITCHBOARD + NOUN
▪ operator
PREPOSITION
▪ on a/the ~
▪
the man on the ~
▪ through a/the ~
▪
All calls must pass through the ~.