A quaver is a musical note that is half as long as a crotchet. if your voice quavers, it shakes as you speak, especially because you are nervous or upset (quave (13-19 centuries))
If someone's voice quavers, it sounds unsteady, usually because they are nervous or uncertain. Her voice quavered and she fell silent. = tremble Quaver is also a noun. There was a quaver in Beryl's voice
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 To utter with quavers