to shake tremulously; quiver or tremble

He stood there quavering with fear.

to sound, speak, or sing tremulously

Her voice quavered a moment and then she regained control.

to perform trills in singing or on a musical instrument.

to utter, say, or sing with a quavering or tremulous voice.

a quavering or tremulous shake, esp. in the voice.

a quavering tone or utterance.

Music (chiefly British ) . an eighth note.

verb

quake , quiver , shiver , shudder , tremble , twitter , vibrate , falter , note , oscillate , shake , sway , tremor , trill , vacillate , waver , wobble