Definitions for walkout
Random House Webster's College Dictionary
a strike by workers.
the act of leaving or being absent from a meeting, esp. as an expression of protest.
Origin of walkout:
a strike in which the workers walk out
the act of walking out (of a meeting or organization) as a sign of protest
"there was a walkout by the Black members as the chairman rose to speak"
a sudden stoppage of work; a strike
a similar mass action of people leaving a place as a form of protest