sellout

[sel-out]
noun
1.
an act or instance of selling out.
2.
an entertainment, as a show or athletic event, for which all the seats are sold.
3.
Informal. a person who betrays a cause, organization, or the like; traitor.
4.
Informal. a person who compromises his or her personal values, integrity, talent, or the like, for money or personal advancement.

Origin:
1855–60, Americanism; noun use of verb phrase sell out

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
sellout

noun
an act of betrayal 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
The traitor category includes persons who have a malevolent intent to damage,
  destroy, or sellout their organization.
From that day to this, he's been playing to sellout crowds.
Venues must select only one of these options for declaring a sellout for an
  event.
Your participation here and it is indeed a sellout crowd today, is evidence
  that there is a great need for this program.
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