quaver

Noun
  1. A tremulous sound (synset 107405457)
  2. A musical note having the time value of an eighth of a whole note (synset 106884434)
Verb
  1. Give off unsteady sounds, alternating in amplitude or frequency (synset 201052990)
  2. Sing or play with trills, alternating with the half note above or below (synset 201052768)

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