"quaver" in the noun sense
a tremulous sound
2. eighth note, quaver
a musical note having the time value of an eighth of a whole note
"quaver" in the verb sense
1. quaver, waver
give off unsteady sounds, alternating in amplitude or frequency
2. warble, trill, quaver
sing or play with trills, alternating with the half note above or below
Source: WordNet® (An amazing lexical database of English)
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