to sell goods or services at a lower price than your competitors 以低於竞争对手的价格出售；廉价出售◆The bank says it will undercut rivals' rates and services. 这家银行称它将把利率和服务费降至低於竞争对手。◆The scale of the company allows them to undercut prices. 公司的规模使他们能够以低价销售。
to make sth weaker or less likely to be effective 削弱◆Unions claim that the legislation undercuts workers' rights. 工会声称这项立法削弱了工人的权利。