To leave a place suddenly, often as a form of protest or disapproval. The workers decided to walk out of the meeting when their demands were not addressed.
To abandon or leave someone, especially a partner or family, without warning or explanation. He walked out on his family, leaving them to fend for themselves.
To exit a place by walking, often used to describe leaving a performance or event before it is finished. Several audience members walked out of the theater during the controversial scene.