N-COUNT
出价人；投标人；竞标者
A bidder is someone who offers to pay a certain amount of money for something that is being sold. If you sell something to the highest bidder, you sell it to the person who offers the most money for it.
例句
The sale will be made to the highest bidder subject to a reserve price being attained.
只要达到了拍卖底价，标的物就会出售给出价最高的竞买人。