动词房价谈妥后又抬价改售给

名词敲诈；欺诈

1. （房价议定后因有人出高价而）对…食言，对…悔约
If you are gazumped by someone, they agree to sell their house to you, but then sell it to someone else who offers to pay a higher price.

e.g. In France you cannot be gazumped...
在法国买房不会出现抬价毁约的情况。