/ gəˈzʌndə(r); NAmE / verb
[ vn ] [ often passive ] ( BrE ) to offer a lower price for a house that you have already agreed to buy at a higher price, before the contract is signed :
The vendors were gazundered at the last minute.
► gaz·un·der·ing noun [ U ]
—compare gazump
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WORD ORIGIN
late 1980s: humorous blend of gazump and under .