verb
to undermine or discredit the legitimacy or authority of something
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The opposition party's attempts to delegitimize the election results were met with strong criticism.
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Don't listen to those rumors, they're just trying to delegitimize the new manager.
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I can't believe they're still trying to delegitimize her accomplishments, it's so unfair.
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His constant criticism of her work was a way to delegitimize her authority in the office.