There is a very good reason people are walked out when they are fired or laid off.
What does that mean?
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To walk [someone to a place] means to escort or accompany them to that place; to walk with them.
In this case, if you've just fired a man from his job, it's a good idea to have someone walk with him to his desk while he gathers his belongings, and then walk with him to the exit, to make sure that he doesn't steal or damage anything on his way out.