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Assume a powerful or rich person (like a boss in an office) and assume there is guy who wants to get some benefits from that person. He always does every thing and says every lies to make the powerful guy happy. I know an impolite phrase to describe this person, which has something to do with kissing certain part of the body of the powerful guy. But, I was wondering what is the polite and literal way to call this type of individuals and what is called this action?