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.-to support, uphold, or aid; to maintain; -- in a good sense.-to contribute, as an assistant or instigator, to the commission of an offense.-act of abetting; aid.