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From The Collaborative International Dictionary of English v.0.48:
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.] 1. To tremble; to vibrate; to shake. --Sir I. Newton. [1913 Webster] 2. 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 [1913 Webster]