bid sth up
phrasal verbwithbidverbuk/bɪd/uspast tense and past participlebid
if severalpeoplebidsomething up, theycausethepriceof it toriseby eachofferingtopaymore for it:
Multimillionaires oftensitacrossthetablefrom one another, bothwantingthe sameproperty, andbiddingupprices.