defect
noun
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a mark or flaw that spoils the appearance of something (especially on a person's body)blemish
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a failing or deficiency“that interpretation is an unfortunate defect of our lack of information”shortcoming
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an imperfection in a bodily system“visual defects”
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an imperfection in an object or machinefault
verb
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desert (a cause, a country or an army), often in order to join the opposing cause, country, or armydesert