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Related to sell short: Buy to Cover
sell (someone, something, or oneself) short
To undervalue someone, something, or oneself; to underestimate or underappreciate the good qualities of someone, something, or oneself. Don't sell yourself short—your writing is really excellent! I know you don't like their pitcher, but don't sell him short; he's inarguably one of the best in the league. I think they're selling this short. It's actually an incredibly good deal!
sell someone or something short
Fig. to underestimate someone or something; to fail to see the good qualities of someone or something. This is a very good restaurant. Don't sell it short. When you say that John isn't interested in music, you're selling him short. Did you know he plays the violin quite well?
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]
sell yourself/somebody/something ˈshortdescribe yourself/somebody/something as being less good, valuable, etc. than you, etc. really are: Don’t sell yourself short when you go for an interview. ♢ It was a great idea, but you sold it short.
1. To contract for the sale of securities or commodities one expects to own at a later date and at more advantageous terms.
2. To underestimate the true value or worth of: Don't sell your colleague short; she's a smart lawyer.