switchboard noun
ADJ. busy | telephone
VERB + SWITCHBOARD call, ring | jam, swamp The BBC switchboard was jammed with furious calls. | be/work on, operate
SWITCHBOARD + NOUN operator
PREP. on a/the ~ the girl on the switchboard | through a/the ~ All calls must pass through the switchboard.
You can also check other dicts: switchboard (English, 中文解释 ), wordnet sense, Collins Definition