variants:
or co-conspirator
plural coconspirators or co-conspirators
Definition of coconspirator
: a person who conspires with one or more others : a fellow conspirator
… he was named as an unindicted coconspirator … — Trans-Action Five of his co-conspirators were also jailed for their roles in the plot.— Tom Powell … was one of four alleged co-conspirators indicted following what officials called one of the largest data breaches in history …— Stewart Bell and Adrian Humphreys
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Merriam-Webster unabridged
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Time Traveler for coconspirator
The first known use of coconspirator was in 1863
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