clown
/klaun; klaʊn/ n
1 comic entertainer (esp in a circus) who paints his face and dresses in a ridiculous way and performs funny or foolish tricks 滑稽演员; （尤指马戏团的）小丑.
2 person who is always behaving comically 举止一贯滑稽可笑的人. clown, v [I, Ip]
~ (about/around) (usu derog 通常作贬义) act in a foolish or comical way, like a clown 扮小丑
Stop clowning around! 不要再像小丑那样胡闹了!