GAZUMP is validvalid

to cheat by raising the price originally agreed upon [v GAZUMPED, GAZUMPING, GAZUMPS] : GAZUMPER [n]

20,687 of 196,601 in NWL2023·also valid in CSW24

(colloquial) to unfairly acquire a property by bidding more than an offer that has already been accepted [v -ED, -ING, -S]