The definition of an accomplice is a person who helps another person do something wrong or illegal.(noun)
The driver of a get-away-car during a bank robbery is an example of an accomplice.
See accomplice in Webster's New World College Dictionary
Origin: < ME a complice (the article a is merged, infl. by accomplish) < OFr complice < LL complex: see complice
See accomplice in American Heritage Dictionary 4
Origin: Alteration of complice.
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