sing like a canary

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sing like a canary

To inform against someone to the police or other authority about his or her 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
References in periodicals archive ?
Does he mean to say that the plethora of information unearthed by a British journalist who travelled to the village of the only surviving terrorist (currently in police custody singing like a canary and spilling a lot of beans), is a bunch of lies?