後會無期

后会无期
hòuhuìwúqī
  1. to meet again at unspecified date
  2. meeting postponed indefinitely

CEDICT

to not know when paths will cross once more

Wiktionary

以後不一定會有相見的時候

維基詞典

Entry Composition

1 後 hòu
  1. back
  2. behind
  3. rear
  4. afterwards
  5. after
  6. later
  7. post-
2 會 huì
  1. can; to have the skill; to know how to
  2. to be likely to; to be sure to
  3. to meet; to get together
  4. meeting; gathering
  5. (suffix) union; group; association
  6. (bound form) a moment (Taiwan pr. huǐ)
3 無期 wúqī
  1. unspecified period
  2. in the indefinite future
  3. no fixed time
  4. indefinite sentence (i.e. life imprisonment)