To liquidate (sell or dispose of) assets of a corporation or partnership.  Liquidating the assets of a corporation or partnership, settling accounts, paying bills, distributing remaining assets to shareholders or partners, and then dissolving the business. Winding up a non-profit corporation requires a plan for distribution of assets to some charitable or other non-profit entity. 
For example, a portfolio manager might decide to liquidate a position in a stock by selling all the shares of that stock held in the portfolio. 
c.1575, "to reduce to order, to set out clearly," sense of "clear away" (a debt) first recorded 1755. The meaning "wipe out, kill" is from 1924.  Wind up "come to a conclusion" is from 1825. Winding sheet "shroud of a corpse" is attested from 15c.