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vaunt (v.)[vaunt 词源字典]: early 15c., "speak vainly or proudly," from Anglo-French vaunter, Old French vanter "to praise, speak highly of," from Medieval Latin vanitare "to boast," frequentative of Latin vanare "to utter empty words," from vanus "idle, empty" (see vain). Also short for avaunten "to boast" (see vaunt (n.)). Related: Vaunted; vaunting.[vaunt etymology, vaunt origin, 英语词源]