walk out in WordNet English dictionary

1. stop work in order to press demands
   "The auto workers are striking for higher wages"; "The employees walked out when their demand for better benefits was not met"
   strike  walk out 
   
2. leave suddenly, often as an expression of disapproval
   "She walked out on her husband and children"
   walk out 
   
3. leave abruptly, often in protest or anger
   "The customer that was not served walked out"
   walk out 
   

walk out in English Wiktionary