(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.