sing like a birdie

sing like a birdie

To inform (against someone) to the police or other authority about their criminal or illicit behavior. I heard Joey Malone has been singing like a birdie in the hopes of getting his sentence reduced. Let's make sure he's sleeping with the fishes before he gets to trial!
See also: birdie, like, sing
Farlex Dictionary of Idioms.
See also:
  • sing like a canary
  • tattle
  • blue code of silence
  • blue wall of silence
  • code
  • silence
  • stolen fruit is (the) sweetest
  • stolen fruit is sweet
  • stolen fruit is sweetest
  • stolen pleasures are (the) sweetest