Longman Dictionary of Contemporary English homepage

sell-out

 noun
     
sell-out , sell‧out [singular]
1 a performance, sports game etc, for which all the tickets have been sold:
The concert was expected to be a sell-out.
a sellout crowd of 32,000
2 informal a situation in which someone has not done what they promised to do or were expected to do by the people who trusted them:
a sellout of the poor for political reasons
3 informal someone who has not done what they promised to do or who is not loyal to their friends or supporters, especially in order to become more popular, richer etc:
Many black students regarded him as a sellout.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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