A person who flatters or ingratiates themselves with someone in power.

चाटुकार

English Usage: He was known as a bootlicker, always agreeing with his boss to gain favor.

Hindi Usage: वह एक चाटुकार के रूप में जाना जाता था, हमेशा अपनी बॉस से पक्ष प्राप्त करने के लिए सहमत रहता था।