noun
accomplice
uh-KAHM-plis/əˈkɑːmplɪs/
a person who helps another commit a crime or wrongdoing
The thief's accomplice keeps watch while the stolen wallet is hidden.

Etymology
The ancestor meant a partner or confederate, not specifically a criminal associate. That general idea of partnership narrowed to someone involved with another in a crime or wrongdoing.
In context
Criminal where the use is Criminal the seller is an accomplice in the crime and punishable as such
More examples
- Police charged him as an accomplice in the theft.
- She refused to become an accomplice to the fraud.
- The robber escaped with help from two accomplices.
Forms
accomplice · accomplices