hailer
/ˈheɪlər/
noun
- A person who calls out to get someone's attention, especially to greet them or to get a taxi.
- The hailer on the street corner waved frantically at the approaching cab.
- In the busy city, a good hailer can get a taxi faster than someone who just stands there.
- The hailer shouted across the crowd to his friend on the other side.
- A device used to make a loud sound to call attention, such as a horn or a loudspeaker.
- The police car's hailer blared a warning to the fleeing suspect.
- The ship's captain used a hailer to communicate with the crew on the dock.
- The lifeguard picked up the hailer and told everyone to get out of the water.