verb · to submit a document or report to higher authorities

这份年度报告上行之后，还需要等待上级的批复。

verb · traveling toward the capital or a major hub (especially of trains)

这列火车是上行的，终点站就是首都北京。

verb · to go against the current (of river boats)

船只在长江中上行，速度比较缓慢。