1. to raise the price of a property after agreeing to sell it at a lower price
Usage: chiefly British; informal

Examples

• The seller decided to gazump the buyer when a higher offer came in.
• We were gazumped just days before closing on our new house.
• Real estate agents warned us that we could be gazumped if we didn't act quickly.
• After agreeing to the original price, the homeowner gazumped us by £50,000.
• Gazumping is a risky practice that can damage a seller's reputation.