私下

sīxià
in private

CEDICT

Entry Composition

1 私 sī
  1. personal
  2. private
  3. selfish
2 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