The word "by-bid" means a higher bid offered after an initial bid has been made in an auction. It is a term commonly used in auction houses and online bidding platforms. There are several synonyms for the word "by-bid," including "overbid," "counterbid," and "top bid." These terms are used interchangeably and indicate a bid that surpasses the current highest bid. The use of synonyms for "by-bid" can help make auction bidding more interesting and competitive. Regardless of the term used, the main objective is to offer a higher bid and win the auctioned item.