Training Tools

noun a small device that makes a high-pitched sound when blown into, typically used for signaling or as a musical instrument

verb to make a high-pitched sound by forcing breath through a small hole or by blowing into a small device

• The referee blew the whistle to signal the end of the match.
• I can whistle really loudly, want to hear?
• She's always whistling a tune while she works.
• The wind made the trees whistle in the night.