GAZUMP

[verb] [T] [UK and ANZ] [informal] - (of the owner of a house) to refuse to sell your house to (someone you have agreed to sell it to) and sell it instead to someone who offers to pay more for itSally's offer for the house has been accepted, but she's worried she might be gazumped. [T]There have been more reports of gazumping in parts of London where there is not enough property to meet demand from first-time buyers.