go short

verb2

1. •
   (UK) To have an insufficient amount.

   • My parents were very poor, and we often went short of food.
2. •
   To sell a financial product (such as a share) now, even though one does not presently own it, in the hope of buying it more cheaply for delivery at a later date, so as to profit from a fall in price below the price at which one sold it; cf. go long.