Someone's accomplice is a person who helps them to commit a crime. The gunman escaped on a motorcycle being ridden by an accomplice. a person who helps someone such as a criminal to do something wrong (Probably from a complice, mistaken for acomplice; complice (15-19 centuries) from , from complex, from complicare ( COMPLICATE))
An associate in the commission of a crime; a participator in an offense, whether a principal or an accessory