sell short

Verb
  1. Sell securities or commodities or foreign currency that is not actually owned by the seller, who hopes to cover (buy back) the sold items at a lower price and thus to earn a profit (synset 202247968)
  2. Underestimate the real value or ability of (synset 200673572)
    "Don't sell your students short--they are just shy and don't show off their knowledge"

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