So, when I had pledged myself to comfort and abet Herbert in the affair of his heart by all practicable and impracticable means, and when Herbert had told me that his affianced already knew me by reputation and that I should be presented to her, and when we had warmly shaken hands upon our mutual confidence, we blew out our candles, made up our fire, locked our door, and issued forth in quest of Mr. Wopsle and Denmark.
There are no more uses of "abet" in the book.
Show samples from other sources
The man who could not be discourteous to a ground-squirrel had sat in the courthouse abetting the cause of grubby-minded little men.
Harper Lee -- Go Set a Watchman
Not telling her is tantamount to aiding and abetting the enemy.