bullhorn

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bullhorn

[′bu̇l‚hȯrn]
(communications)
A portable loudspeaker, generally with built-in amplifier and microphone, used for voice messages to crowds or from one ship to another at sea.
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Eventually, I gave up inquiring about whether people had encountered these bullhorns, but I cannot forget the reaction of one person who told me about hearing the bullhorns in Cubao: That person sighed contentedly and said, 'It used to be tough to go to sleep at night with all the wandering noisy teenagers.
Mark Lamoreaux, 62, of Paxton, another tea party member, led the crowd with a bullhorn.
People are out there on the bullhorn trying to disturb the media.
The tension erupted Wednesday into full-scale blows as on- and off-campus groups from as far as Berkeley converged onto campus with picket signs, bullhorns and impromptu chants to protest at CSUN's Court of Community, a quad area just outside the Northridge Center where the debate between Duke and Hicks took place.
Since there was no way to talk to confused, angry passengers when the underground trains that move people from concourse to concourse failed, they had to use bullhorns.