undersellPronunciation: /ʌndəˈsɛl/Translate undersell | into French | into Italian | into Spanish Definition of undersell verb (past and past participle undersold) [with object] sell something at a lower price than (a competitor): we can equal or undersell mail order promote or value (something) insufficiently: she feels she was underselling herself by putting her disability high on her CVundersell in other Oxford dictionaries Definition of undersell in the US English dictionary