upriverWiktionary 原文英美adj.上游的，向水源的中文释义来自 ECDICT构词拆解upup-前缀riverriver词干up-Used to indicate increase. · Used to indicate higher position or direction, literally or figuratively.词源说明From up- + river.释义副词adverb1Towards the source of a river.2Against the current.形容词adjective1Towards the source of a river.