Someone's accomplice is a person who helps them to commit a crime.
例句
The gunman escaped on a motorcycle being ridden by an accomplice.持枪歹徒坐上一辆由同伙驾驶的摩托车逃逸。His accomplice was arrested after a high-speed police chase.经过警方的一番飞车追逐,他的同伙遭到逮捕。
英汉词典释义
n.
从犯, 帮凶, 同谋
She was her husband's accomplice in murdering a rich old man.她是她丈夫谋杀一个老富翁的帮凶。The thief was not alone.We know he had an accomplice.那小偷不是一个人, 我们知道他还有个同谋。
英英词典释义
Noun
1. a person who joins with another in carrying out some plan (especially an unethical or illegal plan)