"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.
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Definitions of calumniation
a false accusation of an offense or a malicious misrepresentation of someone's words or actions;