To leave suddenly, especially as a form of protest(verb)
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Use "walk out" in a sentence
"I walk out of Superduper Pawn not quite three hundred dollars richer."
"We walk out of the courtyard through the main building, past the marble staircase and the huge mirror where Nina and I used to meet before classes, into the gray expanse of the Neva Embankment."
"The grease-stained men who worked at Metal Craft were afraid to walk out into the gravel yard for fear of being shot."