沉潛

沉潜
chénqián
  1. to lurk under water
  2. to immerse oneself in (study etc)
  3. to lie low; to keep a low profile
  4. quiet; reserved; self-possessed

CEDICT

  1. (literary) reserved
  2. reserved
  3. to concentrate one’s mind
  4. to stay under water

Wiktionary

Entry Composition

=1 沉 chén variant of 沉 chén
=1 沉 chén
  1. to submerge
  2. to immerse
  3. to sink
  4. to keep down
  5. to lower
  6. to drop
  7. deep
  8. profound
  9. heavy
2 潛 qián
  1. hidden
  2. secret
  3. latent
  4. to hide
  5. to conceal
  6. to submerge
  7. to dive

Related entries

埋頭 máitóu
  1. to immerse oneself in
  2. engrossed in sth
  3. to lower the head (e.g. to avoid rain)
  4. countersunk (of screws, rivets etc)
他整天都在埋頭埋腦地看小說，連飯也沒有吃。

He has been absorbed in the novel all day without eating.

Source: Tatoeba

埋首 máishǒu to immerse oneself in (one's work, studies etc)