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"
例句
用作动词(v.)
We won't sell short and make our fortune.我们不搞卖空来发财。
Mr.Wells made a fortune on the stock exchange by selling short.威尔斯先生在证券交易所通过卖空发了笔横财。
