to sing like a bird

A) To voluntarily confess your 'secular sins to the cops
B) for monotheists, to confess their religious sins, not actual legal crimes, duringg confession
C) to rat out other members of your criminal enterprise

If you are going sing like a bird definition c), you should probably cowboy up and go to jail , not get witness protection, since you don't want to sing like a bird, definition a) as well.