whistle

/wɪsl̩/verb

To produce a sharp, high sound by blowing air through the lips.

Example sentence

“He whistled a cheerful tune as he walked to work.”

To 'blow the whistle' on wrongdoing means to expose it, which is where 'whistleblower' comes from.

Related words

medalA flat piece of metal, usually round and stamped with a design, given as an award or honor.opponentA person who competes against you or takes the opposite side, and tries to stop you from succeeding.trophyA prize, often shaped like a cup, shield, or small statue, given to celebrate winning a contest or reaching a notable achievement.teammateA person who plays or works on the same team as you.competeTo take part in a contest and try to win something, such as a prize or position, that others also want.gymnasticsA sport in which athletes perform routines of controlled movements that demand strength, balance, and flexibility.