verb
(intransitive) To ring a bell slowly, especially for a funeral; to toll.
(transitive) To signal or proclaim something (especially a death) by ringing a bell.
(transitive) To summon by, or as if by, ringing a bell.
noun
The sound of a bell knelling; a toll (particularly one signalling a death).
(figuratively) A sign of the end or demise of something or someone.