sell out

sell out idiom
  1. Dispose of entirely by selling. For example, The rancher finally sold out to the oil company, or The tickets to the concert were sold out a month ago. [Late 1700s]
  2. Betray one's cause or colleagues, as in He sold out to the other side. [Slang; late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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