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。
N-COUNT
努力爭取者；圖謀者
A bidder for something is someone who is trying to obtain it or do it.
例句
...bidders for two licences to develop cellular telephone systems in Greece.努力爭取得到兩張在希臘開發移動電話系統許可證的運營商
英漢詞典釋義
n.
出價者，投標人
The other bidders for the contract complained that it had not been a fair contest.其他競標人抱怨說該合同的競標不公平。TV franchises will be auctioned to the highest bidder.電視特許經營權將拍賣給出價最高的投標人。