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English definition of “megaphone”

megaphone

noun [C]     /ˈmeɡ.ə.fəʊn/ US  /-foʊn/
a cone-shaped device that makes your voice louder when you speak into it, so that people can hear you although they are not near to youAmplifiers, microphones and speakers
(Definition of megaphone noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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