sell-out

Universal Words noun [usuallysing.] 1 a play, concert, etc. for which all the tickets have been sold: Next week's final looks like being a sell-out. * a sell-out tour 2 a situation in which sb betrays a person or group who trusted them, by not doing sth that they promised to do, or by doing sth that they promised not to do: The workers see the deal as a union sell-out to management.