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Definition of abettor : One who abets; an instigator of an offense or an offender.

Synonyms:

aid, reliever, succorer, help, abetter

auxiliary, patsy, accessory, henchman, hireling, aider, proxy, junior, benefactor, attendant, adjunct, underling, functionary, flunky, assistant, accomplice, chaperone, backer, attorney, acolyte, helpmate, agent, aide, helper, servant, employee, aide-de-camp, laborer, ancillary, stooge, minion, partner, subordinate, lieutenant, follower, associate, deputy, menial, second, extra

colleague, ally, supporter

Usage examples:

• That places Mrs. Odell- Carney in the position of being an abettor or accomplice: she's had the distinction of being a sharer in a most glorious piece of strategy. - "The Husbands of Edith", George Barr McCutcheon.
• Each of these wrong opinions is an illustration and type, as it is a standing support and abettor, of some kind of wrong reasoning, though they are not all on the same scale nor all of them equally instructive. - "On Compromise", John Morley.
• I shall be looked upon as your accomplice and abettor- people will say Jonathan Wild was but a type of me- boys will hoot at me as I pass along; and the cinder- wenches belch forth reproaches wafted in a gale impregnated with gin: I shall be notorious- the very butt of slander, and sink of infamy! - "The Adventures of Roderick Random", Tobias Smollett.