gazumping

UK: /gəˈzʌmpɪŋ/

WordReference Random House Unabridged Dictionary of American English © 2025

ga•zump  (gə zump′), [Brit. Slang.]
v.t. 

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.

n. 

2. an act of gazumping.

• earlier gazoomph to swindle, argot word of uncertain origin, originally 1925–30

ga•zump′er, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

gazump / ɡəˈzʌmp/ verb

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

noun

1. the act or an instance of gazumping

Etymology: 20th Century: of uncertain origin

gaˈzumper noun