sing like a canary

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 canary in the hopes of getting his sentence reduced. Let's make sure he's sleeping with the fishes before he gets the chance!

See also: canary, like, sing

See also:

sing like a birdie
blue code of silence
blue wall of silence
code
stolen fruit is (the) sweetest
stolen fruit is sweet
stolen fruit is sweetest
stolen pleasures are (the) sweetest
with (one's) hand in the cookie jar
with your hand in the cookie jar

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