gazump

verb (used with object)

1. to cheat (a house buyer) by raising the price, at the time a contract is to be signed, over the amount originally agreed upon.

noun

2. an act of gazumping.

verb

1. to raise the price of something, esp a house, after agreeing a price verbally with (an intending buyer)
2. (tr) to swindle or overcharge

noun

3. the act or an instance of gazumping