megaphone
Word family adjectivemegaphonicnounmegaphone
meg·a·phone /ˈmeɡəfəʊn $ -foʊn/ noun
1. 
TPGO[countableC] a piece of equipment like a large horn which you talk through to make your voice sound louder, when you are speaking to a crowd 扩音器，喇叭筒，传声筒 →5 see picture at 见图 microphone
TPGO[countableC] a piece of equipment like a large horn which you talk through to make your voice sound louder, when you are speaking to a crowd 扩音器，喇叭筒，传声筒 →5 see picture at 见图 microphone2. megaphone diplomacy the practice of making strong or threatening statements in order to make another country do what you want 扩音器外交〔指一国通过发表强硬或威胁性声明迫使别国同意其要求的外交做法〕
Examples from the Corpus
megaphone• Perhaps conscious that he had gained a megaphone reputation, Meacher had settled down to his own social security review.• The clerk touched each elector on the head, and counted each poll aloud over a megaphone.• An inspector spoke through a megaphone while the armed squad kept watch.• A lot of them had megaphones.• They were directed back to their positions by the first assistant and his megaphone, and a second take began.• After some further conversation, he raised his megaphone to announce a break.• He has always looked for one more megaphone.• Sure enough, there he was, Cord Shay, at the megaphone.
(1800-1900) Greek megas “large” + phone “voice, sound”