Entertainment / Literature / Vocalization: In linguistics, the change from a consonant sound to a vowel sound.
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Science / Psychiatry / Tic: An involuntary, sudden, rapid, recurrent, nonrhythmic, stereotyped motor movement or vocalization. MORE
Lifestyle / Adoption / Tourettes Syndrome: A treatable neurological disorder that consists of involuntary 'tic' movements or vocalizations that become more apparent under stress. Common manifestations include shoulder-shrugging, neck-jerking, MORE