verb-intransitive. To tremble; to vibrate; to shake.verb-intransitive. 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.v. To utter with quavers.n. A shake, or rapid and tremulous vibration, of the voice, or of an instrument of music.n. An eighth note. See Eighth.