"quavering" 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
"quavering" in the adjective sense
1. quavering, tremulous
of the voice) quivering as from weakness or fear
"the old lady's quavering voice"
"spoke timidly in a tremulous voice"
Source: WordNet® (An amazing lexical database of English)
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