Abet is common word, made commoner in phrase ‘aid and abet’. And actually this phrase carries a certain redundancy: both the words carry almost the same meaning. The use of aid in this expression is more for the effect that it makes rather than adding any practical meaning to the phrase.
The dictionary definitions for Abet are as follows:
1. To approve, encourage, and support (an action or a plan of action); urge and help on. (verb)
2. To urge, encourage, or help (a person), esp. in wrongdoing. (verb)
Masters Tip to remember Abet:
Each one of us has seen a crutch (A wooden or metal staff that fits under the armpit and reaches to the ground; used by disabled person while walking) and at some point of time, we have acted as one for someone or the other. The Crutch is our method of remembering Abet: To act as one in thought, to provide assistance or help is what to ‘abet’ is all about.
In terms of usage, the word abet can be used in the following ways:
1. Even Lady Janet was not far enough gone in folly to abet him in this. -The New Magdalen by Collins, Wilkie
2. Some Harvard professors run international development organizations in their spare time. Others participate in the governing of our country, advising the president on human rights or economics policy. Others run public service think tanks. Others, it turns out, advise and abet internationally despised dictatorial regimes
3. Kill the Irishman aims to come out bumping chests in upstart insouciance, hoping to abet Greene’s famous bravado.- http://www.laweekly.com/2011-03-10/film-tv/kill-the-irishman/