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

他在北京站登上了这趟下行列车。

verb · to travel downstream with the current (of river boats)

船只顺流下行，速度极快。

noun · writing or printing that proceeds vertically from top to bottom on the page

古籍中的文字通常是下行书写的。

to issue or send an official document to lower bureaucratic or administrative levels

这份文件属于下行文，已经发往各乡镇。