A knell is a ringing sound, particularly from a bell tolled to announce a death or the end of something. Which is kind of depressing.

From the Old English cnyll, meaning “sound made by a bell when struck or rung slowly,” comes our modern day knell. It certainly describes the slow, ominous sound of funeral bells, but isn't always used so literally: We often say that a final blow or action that will bring an end to something sounds or signals the death knell. And if you hear a bell knell in your dreams, look out — superstition says that's not a good sign.

Definitions of knell
  1. noun
    the sound of a bell rung slowly to announce a death or a funeral or the end of something
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    type of:
    bell, toll
    the sound of a bell being struck
  2. verb
    ring as in announcing death
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    type of:
    peal, ring
    sound loudly and sonorously
  3. verb
    make (bells) ring, often for the purposes of musical edification
    synonyms: ring
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    ring slowly
    type of:
    cause to sound
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