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1. Of a stock of something, to be sold completely. The tickets sold out in a matter of minutes. I've been trying to find the toy Janet wants for Christmas, but every store is sold out.
2. To abandon or betray one's espoused principles or cause, especially in the pursuit of profit or personal advantage. Many of his fans felt he sold out when he signed on to a major record label.
[of a product] completely sold with no more items remaining; [of a store] having no more of a particular product. The tickets were sold out so we couldn't go to the concert. I wanted new shoes like yours, but they were sold out.