WordReference Random House Learner's Dictionary of American English © 2014
bull•horn or bull horn/ˈbʊlˌhɔrn/USA pronunciation  n. [countable]

    a high-powered, electrical loudspeaker:Talking through the bullhorn, the detective persuaded the gunman to surrender.


Collins Concise English Dictionary © HarperCollins Publishers::

bullhorn /ˈbʊlˌhɔːn/ n
  1. US Canadian a portable loudspeaker having a built-in amplifier and microphone
    Also called (in Britain and certain other countries): loud-hailer



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