verb (used with object)
to cheat (a house buyer) by raising the price, at the time a contract is to be signed, over the amount originally agreed upon.
an act of gazumping.
Origin of gazump
First recorded in 1925–30; earlier gazoomph to swindle, argot word of uncertain origin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
to raise the price of something, esp a house, after agreeing a price verbally with (an intending buyer)
(tr) to swindle or overcharge
the act or an instance of gazumping
Word Origin for gazump
C20: of uncertain origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012