- 1a play, concert, etc. for which all the tickets have been sold Next week's final looks like being a sellout. a sellout tour
- 2 a situation in which someone is not loyal to a person or group who trusted them, by not doing something that they promised to do, or by doing something that they promised not to do The workers see the deal as a union sellout to management.
- 3 someone who is not loyal to a person or group who trusted them, especially by giving up their beliefs or principles The actor was accused of being a sellout to his own culture.