遡 [－]

Jyutping sou3
Pinyin sù

Definitions (Unihan)
  1. go upstream
  2. trace source
  3. formerly
  4. Cangjie Input
    YTUB

遡 [溯]

Jyutping
Pinyin sù

Definitions (CC-CEDICT)
  1. variant of 溯[su4]