gazump
/gəˈzʌmp; ɡə`zʌmp/ v[Tn usu passive 通常用於被动语态]
(Brit infml derog 口, 贬) raise the price of property, esp a house, after accepting an offer from (a buyer) 抬价敲诈（尤指房产, 价格议定後再抬价）
We shan't be buying the house
we've been gazumped (by the owner). 我们不想买那所房子了, 卖主变卦要敲诈我们.