What does abet mean?
The definition of abet
A*bet”, v.t.
[imp. & p.p. Abetted; p.pr. & vb.n. Abetting.] Etym: [OF. abeter; a (L. ad) + beter to bait (as a bear), fr. Icel. beita to set dogs on, to feed, originally, to cause to bite, fr. Icel. bita to bite, hence to bait, to incite. See Bait, Bet.]

1 To instigate or encourage by aid or countenance; — used in a bad sense of persons and acts; as, to abet an ill-doer; to abet one in his wicked courses; to abet vice; to abet an insurrection. “The whole tribe abets the villany.” South. Would not the fool abet the stealth, Who rashly thus exposed his wealth Gay.
2 To support, uphold, or aid; to maintain; — in a good sense. [Obs.]. Our duty is urged, and our confidence abetted. Jer. Taylor.
3 (Law)
To contribute, as an assistant or instigator, to the commission of an offense.

Synonyms
— To incite; instigate; set on; egg on; foment; advocate; countenance; encourage; second; uphold; aid; assist; support; sustain; back; connive at.

A*bet”, n.
Etym: [OF. abet, fr. abeter.]

Act of abetting; aid. [Obs.] Chaucer.