Wordnet 3.0
VERB (2)
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;
2.
underestimate the real value or ability of;
- Example: "Don't sell your students short--they are just shy and don't show off their knowledge"
WordNet (r) 3.0 (2006):
sell short
v 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
2: underestimate the real value or ability of; "Don't sell your
students short--they are just shy and don't show off their
knowledge"