<p><strong>Noun</strong></p><ul><li>the sound made by a bell rung slowly, especially for a death or a funeral.</li><li>a sound or sign announcing the death of a person or the end, extinction, failure, etc., of something: the knell of parting day.</li><li>any mournful sound.</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to sound, as a bell, especially a funeral bell.</li><li>to give forth a mournful, ominous, or warning sound.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to proclaim or summon by, or as if by, a bell.</li></ul>