潛行 [潜－]

Jyutping cim4 hang4
Pinyin qián xíng

Definitions (CC-CEDICT)
  1. to slink
  2. to move stealthily
  3. to advance through the water
Definitions (Wiktionary)
  1. verb
    to move stealthily; to sneak
  2. verb
    to move under water