词典释义：
offer goods or services at a lower price than (a competitor)
低于（对手）价格出售（商品，服务）
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these industries have been undercut by more efficient foreign producers .这些工业遇上更有效率的外国厂商的低价销售。
cut or wear away the part below or under (something, especially a cliff)
切除，磨去…（尤指悬崖）的下部。
〈喻〉 削弱；暗中破坏
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the chairman denied his authority was being undercut .主席否认自己的权威受到削弱。
cut away material to leave (a carved design) in relief
底切，掏空。
【网球】 下旋削（球）。
a space formed by the removal or absence of material from the lower part of something, such as a cliff, a coal seam, or part of a carving in relief
（悬崖、煤矿、凸雕等）底切；掏空。
〈主 北美〉 反锯口，逆锯口。
〈英〉 牛里脊；牛腰部软肉。