sell out

verb8

1. •
   To sell all of a supply or stock of something.

   • They sold out of concert posters yesterday and won't get another shipment until next week.
2. •
   To abandon or betray one's principles to seek profit or other personal advantage; to abandon or betray one's supporters through this change.

   • It used to be a pleasant little community, until the leaders sold out to the developers.
   • He used to be a voice for the underdog until he sold out.
3. •
   To betray (a person), usually a close friend or family member, for personal gain.

   • I'll kill him if I see him again; he sold me out.
4. •
   To sell one's business (with a connotative emphasis on entirety and finality).

   • The owners long resisted buyout offers, but when they were ready to retire, they finally sold out to a competitor.
5. •
   (historical) To sell one's commission.

   • After the peace of Versailles he resided in England; but, about three years before the breaking out of the Revolution, he sold out his commission in the army and emigrated to New York. — 1857
6. •
   (old-fashioned) To liquidate, sell off, or divest oneself of financial investments, stocks, or government funds.
7. •
   (figurative) To commit or abandon oneself entirely (to a cause, a team, etc.).
8. •
   (no longer used) To hurry out.