sell out

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.