患難之交

患难之交
huànnànzhījiāo
a friend in times of tribulations (idiom); a friend in need is a friend indeed

CEDICT

a rock (a friend who always helps); a friend through thick and thin

Wiktionary

共同經歷困苦艱難而互相扶持的好朋友。

重編國語辭典

共同經歷困苦艱難而互相扶持的好朋友

維基詞典

Entry Composition

1 患難 huànnàn trials and tribulations
2 之 zhī
  1. (possessive particle, literary equivalent of 的 de)
  2. him
  3. her
  4. it
3 交 jiāo
  1. to hand over; to deliver; to pay (money); to turn over
  2. to make friends
  3. (of lines) to intersect
  4. variant of 跤 jiāo