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
underestimate the real value or ability of;
"Don't sell your students short--they are just shy and don't show off their knowledge"
- We won't sell short and make our fortune.
- Mr.Wells made a fortune on the stock exchange by selling short.
- sell short 卖空