Noun
A cooperator.
An associate in the commission of a crime; a participator in an offense, whether a principal or an accessory.
Source: Webster's dictionaryWhen we ask for advice, we are usually looking for an accomplice. Saul Bellow
He who does not bellow the truth when he knows the truth makes himself the accomplice of liars and forgers. Charles Péguy
The sea has never been friendly to man. At most it has been the accomplice of human restlessness. Joseph Conrad
The accomplice is as bad as the thief. Portuguese Proverb
Thieves hunt in couples, but a liar has no accomplice. American Proverb
Thieves hunt in couples, but a liar has no accomplice. Albanian Proverb