Etymology
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calumniate (v.)

"to knowingly utter false charges," 1550s, from Latin calumniatus, past participle of calumniari "to accuse falsely," from calumnia "slander, false accusation" (see calumny). A doublet of challenge. Related: Calumniated; calumniating.

updated on September 17, 2017

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Definitions of calumniate from WordNet

calumniate (v.)
charge falsely or with malicious intent; attack the good name and reputation of someone;
From wordnet.princeton.edu, not affiliated with etymonline.