To plead on someone else's behalf.
To act as a mediator in a dispute; to arbitrate or mediate.
To pass between; to intervene.
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.