'sell short' definitions:

Definition of 'sell short'

(from WordNet)
verb
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
verb
Underestimate the real value or ability of; "Don't sell your students short--they are just shy and don't show off their knowledge"

Synonyms of 'sell short'

From: Moby Thesaurus

Words containing 'sell short'