squeal on

squeal on (one)

To inform a figure of authority about someone else's crime, wrongdoing, or transgression. I'm afraid the mafia will make a hit on me since I squealed on them to the police about their money-laundering operation. Why would you squeal on me to the teacher like that? Don't tell your sister anything, she'll squeal on us the first chance she gets.
See also: on, squeal
Farlex Dictionary of Idioms.

squeal on

v.
To disclose incriminating information about someone: The accountant squealed on her corrupt managers. He squealed on his brother for jumping on the bed.
See also: on, squeal
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • squeal on (one)
  • penalize
  • penalize (someone or something) for (something)
  • penalize for
  • pin (something) on (one)
  • pin on
  • empathize
  • empathize with
  • empathize with (someone or something)
  • ride on (one's) coattails