sell_short
1. [ verb ] underestimate the real value or ability of
Examples:

"Don't sell your students short--they are just shy and don't show off their knowledge"

Related terms: underestimate
2. [ verb ] (stock exchange,business) 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
Related terms: sell commerce
3. [ verb ] deprive somebody of something by deceit
Synonyms: cheat chisel rip_off beat
Examples:

"The con-man beat me out of $50" "This salesman ripped us off!" "we were cheated by their clever-sounding scheme" "They chiseled me out of my money"

Related terms: victimize overcharge swindle juggle bilk cozen beat gazump whipsaw welsh deceiver heist cheat deceive