To discover or expose (someone) as disobedient, dishonest, etc.
To discover, as by asking or investigating.
To uncover a weakness in (someone).
To inform on, especially in betrayal of others.
To contact or cooperate with the police for any reason.
A ball used in the sport of Quidditch.
A thief.
An informer, one who betrays his group.
A nose.
A tiny morsel.