quaver >> /ˈkweɪvər/
Definition: [intransitive verb] (of a person's voice) shake or tremble in speaking, typically through nervousness or emotion.
Example: his voice quavered with rage
Definition: [noun] A shake or tremble in a person's voice.
Example: it was impossible to hide the slight quaver in her voice
Definition: [noun] A note having the time value of an eighth of a whole note or half a quarter note, represented by a large dot with a hooked stem.
Example: Furthermore, a comparison of the way in which crotchets and quavers are notated makes it likely that the same scribe copied both works.