上溯
shàng​sù

to go upstream

shàng​sù to go upstream
  1. 上 shàng particleverb
    to go up
    to climb; to board a vehicle; to mount; to go to a place
  2. 溯 sù
    to go upstream
    (bound form) to go against the stream; to sail or travel upriver

shàng​sù to trace back
  1. 上 shàng particleverb
    to go up
    to climb; to board a vehicle; to mount; to go to a place
  2. 溯 sù verb
    to trace back
    (bound form) to trace back to a source; to recall or look back on the past