旧故

舊故
jiùgù
  1. old friend
  2. former acquaintance

CEDICT

  1. (literary) old acquaintance; old friend
  2. old acquaintance; old friend

Wiktionary

  1. 交往已久的朋友。
  2. 老人。汉．班固《白虎通．卷七．三纲六纪》：「舅者，旧也；姑者，故也。旧故之者，老人之称也。」也作「旧好」、「旧交」。

重編國語辭典

Entry Composition

1 旧 jiù
  1. old
  2. opposite: new 新
  3. former
  4. worn (with age)
2 故 gù
  1. happening
  2. instance
  3. reason
  4. cause
  5. intentional
  6. former
  7. old
  8. friend
  9. therefore
  10. hence
  11. (of people) to die, dead

Related entries

故人 gùrén
  1. old friend
  2. the deceased
故友 gùyǒu
  1. old friend
  2. deceased friend
老友 lǎoyǒu
  1. old friend
  2. sb who passed the county level imperial exam (in Ming dynasty)
老朋友 lǎopéngyou
  1. old friend
  2. (slang) period
  3. menstruation
我们是老朋友了。

We're friends from way back.

We're old friends.

Source: Tatoeba

旧交 jiùjiāo
  1. old friend
  2. former acquaintance
旧友 jiùyǒu old friend
雅故 yǎgù
  1. old friend
  2. correct interpretation
世伯 shìbó
  1. uncle (affectionate name for a friend older than one's father)
  2. old friend
故交 gùjiāo
  1. former acquaintance
  2. old friend
旧识 jiùshí
  1. former acquaintance
  2. old friend