squealer

the neighborhood kids called him a squealer for telling on their games.

he was a known squealer, always reporting rule violations to the referee.

don't be a squealer; keep your friends' secrets safe.

the police warned the informant not to act like a squealer.

he got a bad reputation for being a squealer in high school.

we need someone who won't be a squealer and compromise the mission.

the company suspected he was a squealer to the press.

she accused him of being a squealer and betraying their trust.

he tried to deny being a squealer, but the evidence was overwhelming.

the team warned him not to be a squealer and risk getting caught.

being a squealer can damage your reputation and friendships.