From Longman Dictionary of Contemporary Englishgazumpga‧zump /ɡəˈzʌmp/ verb [transitive] British English informalBB if you are gazumped, the person who is selling you a house sells it to another person who offers them more money We were gazumped at the last minute.Grammar Gazump is usually passive. —gazumping noun [uncountable]→ See Verb tableFrom Longman Business Dictionarygazumpga‧zump /gəˈzʌmp/ verb [transitive] British English informalPROPERTY if you are gazumped, someone who has agreed to sell you a house at an agreed price sells it to someone else for more moneyIf any client of our agency is gazumped, we refund him or her the cost of the valuation fee. —gazumping noun [uncountable]Gazumping is on the increase in London, as buyers find that there is a shortage of good properties.→ See Verb table