下海

xiàhǎi
  1. to go out to sea
  2. to enter the sea (to swim etc)
  3. (fig.) to take the plunge (e.g. leave a secure job, or enter prostitution etc)

CEDICT

Entry Composition

1 下 xià
  1. down
  2. downwards
  3. below
  4. lower
  5. later
  6. next (week etc)
  7. second (of two parts)
  8. to decline
  9. to go down
  10. to arrive at (a decision, conclusion etc)
  11. measure word to show the frequency of an action
2 海 hǎi
  1. ocean
  2. sea
  3. great number of people or things
  4. (dialect) numerous

classifiers: 個, 片