1. portable electronic devices that amplify the voice, typically cone-shaped with a built-in microphone and speaker

Examples

• The protest organizers used bullhorns to address the crowd.
• Police officers carried bullhorns to give instructions during the emergency.
• The coach shouted through a bullhorn from the sidelines.
• Security guards used bullhorns to direct traffic at the event.
• The lifeguards’ bullhorns could be heard across the entire beach.
• Demonstrators with bullhorns gathered outside the courthouse.