The Collaborative International Dictionary
Quaver \Qua"ver\, v. i. [imp. & p. p. Quavered; p. pr. & vb. n. Quavering.] [OE. quaven to shake, to tremble; cf. LG. quabbeln to shake, to be soft, of fat substances, quabbe a fat lump of flesh, a dewlap, D. kwabbe, and E. quiver, v.]
To tremble; to vibrate; to shake.
--Sir I. Newton.Especially, to shake the voice; to utter or form sound with rapid or tremulous vibrations, as in singing; also, to trill on a musical instrument
Wiktionary
vb. (en-past of: quaver)
Usage examples of "quavered".
His voice quavered when faced with so many griffins, awake and mobile, but he puffed himself up and continued.
Her voice quavered with the difficulty of dredging up the determinedly buried memories.
Indeed their rising tones quavered and warbled together like those of wild doves.