knell /ˈnɛl/
  喪鐘聲,哀傷的聲音,凶兆(vt.)(vi.)鳴喪鐘
  Knell n.  The stroke of a bell tolled at a funeral or at the death of a person; a death signal; a passing bell; hence, (figuratively), a warning or harbinger of, or a sound indicating, the passing away of anything; -- also called death knell.
  The dead man's knell
  Is there scarce asked for who.   --Shak.
     The curfew tolls the knell of parting day.   --Gray.
  Knell, v. i. [imp. & p. p. Knelled p. pr. & vb. n. Knelling.]  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.
  Knell, v. t. To summon, as by a knell.
  Each matin bell, the baron saith,
  Knells us back to a world of death.   --Coleridge.
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  knell
       n : the sound of a bell rung slowly to announce a death or a
           funeral or the end of something
       v 1: ring as in announcing death
       2: make (bells) ring, often for the purposes of musical
          edification; "Ring the bells"; "My uncle rings every
          Sunday at the local church" [syn: ring]