பொருள் : 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.
பொருள் : Underestimate the real value or ability of.
எடுத்துக்காட்டு :
Don't sell your students short--they are just shy and don't show off their knowledge.