gazumper

/ɡəˈzʌmpər/
noun
  1. A person who raises the price of a property after already agreeing to sell it, usually to accept a higher offer.
    • The gazumper backed out of the deal when a better offer came along.
    • We were furious when the gazumper demanded an extra $10,000 at the last minute.
    • The real estate agent warned us about dealing with a known gazumper.
Synonyms
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