meg ‧ a ‧ phone /ˈmeɡəfəʊn $ -foʊn/ BrE AmE noun
[ Date: 1800-1900 ; Language: Greek ; Origin: megas 'large' + phone 'voice, sound' ]
1 . [countable] 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
2 . megaphone diplomacy the practice of making strong or threatening statements in order to make another country do what you want