vocal tremor

vocal tremor

Neurology Trembling of one or more muscles of phonation, resulting in an unsteady voice. See Tremor.
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A laryngeal or vocal tremor occurs when the larynx spasms during speech, creating a breathy voice featuring a constantly shifting pitch.
This gives tailor-made reign to Blethyn's hallmark ability to crescendo from a comical and quizzical undulating vocal tremor of sincerity, to decibel-bashing tirade.