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It is argued that Arm. zowr ‘vain’ is the derivational basis of zroyc‘ ‘talk’ with a semantic shift from ‘idle talk’ to ‘talk’. -oyc‘ may be a case-form of a decasuative derivative of the underlying nominal zowr, i.e., *zroy → *zroyk‘, zroyc‘.
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Daniel Kölligan (2024) studied this question.
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