Wiktionary
vb. To be accomplice to someone in an illegal act.
Usage examples of "aid and abet".
I see how a dirty old man might use the law to aid and abet his fickle nature, or his worries about being blackmailed or exposed.
Before she was fabricating reasons, not merely to aid and abet the criminal, but to present him with her virginity on a silver platter.
Platchett was not amused by the idea that she would aid and abet an alleged felon.
Max Fairbanks As well as breaking the law, he's going against an order from a judge, and he asks this meatheaded cop with the dirty hat to aid and abet him in his crime, and the cop does it!
He warned that the Democrats' resolution would aid and abet our enemies in the region.
In return, I swear by die Dark Powers I serve never to harm you dirough magic, but radier to aid and abet you in all of your ambitions that I deem legitimate.
By his reckoning, even if his parents were willing to admit that he was shaych that didn't imply they were minded to aid and abet him.