bull horn


a directional, high-powered, electrical loudspeaker or megaphone.
Also, bull horn.

1950–55; bull1 + horn

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World English Dictionary
bullhorn (ˈbʊlˌhɔːn)
(US), (Canadian) Also called (in Britain and certain other countries): loud-hailer a portable loudspeaker having a built-in amplifier and microphone

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