accomplice

accomplice
/əˈkʌmplɪs; ?@ əˈkɔm-; ə`kɑmplɪs/ n
person who helps another to do sth wicked or illegal 从犯; 帮凶; 同谋
    The police arrested him and his two accomplices. 警方逮捕了他和他的两个同谋.

牛津英汉双解词典