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1. To sell a major asset, such as a home, property, or business. Can be used with or without an object. News that the multinational insurer was looking to sell up in Europe has sent its stock plummeting. A lot of local shop owners have been forced to sell up their businesses as rent in the area has continued to skyrocket. The government wants to build a highway through our land, and they're offering us a pretty hefty sum if we agree to sell up.
2. To sell the possessions or assets of an insolvent debtor for the benefit of their creditor(s). In this usage, a noun or pronoun can be used between "sell" and "up." The bank swooped in and sold us up after our farm went totally bust. Liquidators have been called in to sell up the remains of the bankrupt corporation.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.