Quaver (v. i.) : To tremble; to vibrate; to shake.
Quaver (v. i.) : 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
Quaver (v. t.) : To utter with quavers.
Quaver (n.) : A shake, or rapid and tremulous vibration, of the voice, or of an instrument of music.
Quaver (n.) : An eighth note. See Eighth.