whistle

/ˈwɪsəl/
noun
  1. A small device that makes a high, loud sound when you blow into it.
    • She wore a whistle around her neck for safety when jogging.
    • The coach used a whistle to get the team's attention.
    • The referee blew his whistle to start the game.
  2. The high, clear sound made by blowing through your lips or using a whistle.
    • He gave a sharp whistle to call his dog back.
    • The whistle of the train could be heard from miles away.
    • A loud whistle from the crowd signaled the end of the match.
Synonyms
verb
  1. To make a high, clear sound by forcing air through your lips or using a whistle.
    • She can whistle a tune perfectly after hearing it just once.
    • He whistled for a taxi to stop at the curb.
    • The boy whistled happily as he walked to school.
  2. To move quickly through the air with a whistling sound.
    • Wind whistled through the cracks in the old cabin walls.
    • Bullets whistled overhead during the battle.
    • The arrow whistled past his ear and hit the target.