ga‧zun‧der /ɡəˈzʌndə $ -ər/ verb [transitive] British English informal
[Date: 1900-2000; Origin: Probably from gazump + under]
be gazundered if you are gazundered, someone who has agreed to buy your house says that they will only buy it for less than the amount originally agreed

[TahlilGaran] Dictionary of Contemporary English ▲