sell short

sell short idiom
  1. Contract for the sale of securities or commodities one expects to own at a later date and at a lower price, as in Selling short runs the risk of a market rise, forcing one to pay more than one expected. [Mid-1800s]
  2. sell someone short. Underestimate the true value or worth of someone, as in Don't sell her short; she's a very able lawyer. [First half of 1900s]

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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