To cause to develop athetosis or involuntary writhing movements; to affect with uncontrolled movements.
From 'athetosis' + the productive verb suffix '-ize' (to make or cause). This technical medical verb was formed to describe the process of a condition producing these characteristic movements.
Medical '-ize' verbs are powerful transformers—'atheticize' doesn't just describe the movements themselves but describes the process of actually causing them, like how a brain injury 'atheticizes' a patient's motor control.
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