short selling
US /ˈʃɔːrt ˌsel.ɪŋ/
UK /ˈʃɔːrt ˌsel.ɪŋ/

1.
the selling of shares that the seller does not own, with the intention of buying them back at a lower price and profiting from the difference
:
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He made a fortune through short selling during the market downturn.
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Regulators are looking into the ethics of short selling.