v.tr. (also absol.) Brit. colloq. 1 (of a seller) raise the price of a property after having accepted an offer by (an intending buyer). 2 swindle. gazumper n.
[ 20th c.: orig. uncert. ]
GAZUMP
Meaning of GAZUMP in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012