Source : WordNet®

walk out
     v 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" [syn:
           {strike}]
     2: leave abruptly, often in protest or anger; "The customer
        that was not served walked out"
     3: leave suddenly, often as an expression of disapproval; "She
        walked out on her husband and children"