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
The teacher used a megaphone at sports day so that he could be heard.
The protest organizer used a megaphone to address the gathered crowd and convey messages.
In emergency situations, first responders may use a megaphone to provide instructions.
Coaches at sports events often use a megaphone to communicate with players on the field.
The cheerleading squad coordinated routines using a megaphone to amplify their cheers.
A large megaphone was set up in the square for public announcements during the event.
