1. To walk out (of some place) in order to enter some larger area or a different environment. We had been in the conference room for nearly three hours, so we all stepped out into the sunshine to get some fresh air. The principal stepped out into the courtyard to see what the ruckus was all about.

2. To leave begin or enter into some new or different condition or situation. After 10 years working in finance, Jack decided to step out into the world of interior decorating. You've been pampered and sheltered by your parents your whole life. It's time for you to step out into the real world and learn how to fend for yourself.