An auction offer is a proposed bid made by a prospective buyer during an auction. There are a variety of synonyms for this term based on the context in which it is being used. In terms of bidding, alternatives of an auction offer include a bid, offer, proposal, and tender. In the context of sales, some synonyms for auction offer might include bargain, deal, discount, and markdown. Additionally, in legal or financial contexts, other synonyms of auction offer could include appraisal, estimate, and valuation. It is important to use the most appropriate synonym for auction offer depending on the particular context, as these terms may carry different connotations and meanings.