N-COUNT
出價人;投標人;競標者
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.
只要達到了拍賣底價,標的物就會出售給出價最高的競買人。