deprive somebody of something by deceit; "The con-man beat me out of $50"; "This salesman ripped us off!"; "we were cheated by their clever-sounding scheme"
underestimate the real value or ability of; "Don''t sell your students short--they are just shy and don''t show off their knowledge"
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
