walk of life
A trade, profession, or occupation, as in He'll do well in whatever walk of life he chooses. This expression uses walk in the sense of “line of work.” [c. 1800]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.