n person or group that bids at an auction （拍卖时的）喊价者
*The house went to the highest bidder, ie the person who offered the most money. 房子卖给了出价最高的人.
someone who offers to pay a particular amount of money for something that is being sold
The antiques will be sold to the highest bidder (=the person who offers to pay the most) .
someone who offers to do work or provide services for a particular amount of money, in competition with others
one of 13 bidders for the contract