megaphone
n. countable B1 Intermediate US //ˈmɛɡəˌfoʊn// UK //mˈɛɡəfˌəʊn// mega·phone
n. a large, cone-shaped tool that you hold to your mouth to make your voice sound much louder. It is often used by people who need to speak to a crowd.
n. a cone-shaped device used to amplify the human voice by directing sound waves in a specific direction. Often used in public demonstrations, sports events, or emergency situations.
The coach used a megaphone to shout instructions to the players.
During the protest, the organizer used a megaphone to ensure everyone in the crowd could hear the speech.
The security personnel were equipped with megaphones to manage the flow of the crowd and provide clear, audible directions through the noisy terminal.
From mega- + -phone.
Named for the root Aniba megaphylla + -one.