To make (someone or oneself) aware of some information; to inform, to notify.
To formally impart (information) to someone; to advise, to notify.
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.