SELL OUT

{v.} 1a. To sell all of a certain thing which a store has in stock. * /In the store's January white sale the sheets and pillowcases were sold out in two days./ 1b. To sell all the stock and close the store; go out of business. * /The local hardware store sold out last month and was replaced by a cafe./ 2. {informal} To be unfaithful to your country for money or other reward; be disloyal; sell a secret; accept a bribe./ * /In the Revolutionary War, Benedict Arnold sold out to the British./ * /The dishonest wrestler sold out to his opponent for a hundred dollars./