(verb) deprive of sex or sexual powers. Synonyms: unsex.
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Verb Definition 1
(verb) remove the qualities typical of one's sex. Synonyms: unsex. Example: "She unsexed herself."
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Verb Definition 2
(verb) make infertile. Synonyms: sterilize, sterilise, desex, unsex, desexualize, desexualise, fix. Example: "In some countries, people with genetically transmissible disabilites are sterilized."