To make false and defamatory statements about someone.

किसी के बारे में झूठे और अपमानजनक बयान देना।

English Usage: The politician tried to calumniate his opponent during the campaign.

Hindi Usage: राजनीतिज्ञ ने अभियान के दौरान अपने प्रतिद्वंद्वी के खिलाफ झूठे बयान दिए।