SET ABOUT is an idiom that means to begin or start doing something. It can be used in a variety of contexts, such as when someone is starting a project or task. The crossword solutions for this term are UNDERTAKE (9 letters), ENTERON (7 letters), and LAYINTO (7 letters). UNDERTAKE is a verb meaning to accept responsibility for or begin a task. ENTERON is a verb meaning to begin or set about a task. Lastly, LAYINTO is a verb meaning to attack or begin a task with vigor. All three words can be used to describe the same action of starting a task or project.