suck up to someone
phrasal verb with suck verb uk/sʌk/ us/sʌk/
informal disapproving
奉承，巴结（某人）;拍（某人）马屁
to try to make someone in authority approve of you by doing and saying things that will please them
"Why do you think he offered to take all that work home?" "Oh, he's just sucking up to the boss." “你认为他为什么主动提出把那些工作都带回家做?”“哦，他只不过是为了讨好老板。”