The minimum price at which a seller of property will accept a bid at an auction. Bloomberg Financial Dictionary
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upset price UK US noun [C] US, Scottish PROPERTY
► the lowest price at which a property may be sold, set by a court especially after a foreclosure (= a situation in which a bank takes a property because the owner cannot make payments on the loan): »
Normally, lenders put up houses for auction with bids starting at the upset price in order to recoup their costs.
Financial and business terms. 2012.