(1):
(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
(2):
(n.) An eighth note. See Eighth.
(3):
(v. i.) To tremble; to vibrate; to shake.
(4):
(v. t.) To utter with quavers.
(5):
(n.) A shake, or rapid and tremulous vibration, of the voice, or of an instrument of music.