Knell n. : The stoke of a bell tolled at a funeral or at the death of a person; a death signal; a passing bell; hence, figuratively, a warning of, or a sound indicating, the passing away of anything.

Knell n. : To sound as a knell; especially, to toll at a death or funeral; hence, to sound as a warning or evil omen.

Knell v. t. : To summon, as by a knell.

Example:
Are we witnessing the death Knell of the powerful Florida Cuban American Anti Castro voting block?

Taxonomy
knell, death knell, Dictionary, bell, Old English, Part of Speech, funeral bell, Synonyms, knallen, solemnly, ominous sound, word origin, Etymology Dictionary, signal, failure, origin, bell knelling, Dictionary of Idioms.

Defination from the web:
Knell - Definition of Knell at Dictionary.com a free online dictionary with pronunciation, synonyms, and translation of Knell. Word of the Day and Crossword Puzzles. ... Search another word or see knell on Thesaurus | Reference. Facebook Twitter Follow us: ...