Source : Webster's Revised Unabridged Dictionary (1913)

Knell \Knell\, v. i. [imp. & p. p. {Knelled}; p. pr. & vb. n.
   {Knelling}.] [OE. knellen, knillen, As. cnyllan. See {Knell},
   n.]
   To sound as a knell; especially, to toll at a death or
   funeral; hence, to sound as a warning or evil omen.

         Not worth a blessing nor a bell to knell for thee.
                                                  --Beau. & Fl.

         Yet all that poets sing, and grief hath known, Of hopes
         laid waste, knells in that word, ``alone''. --Ld.
                                                  Lytton.