相濡以沫

xiāngrúyǐmò
  1. lit. (of fish) to moisten each other with spittle (when out of the water) (idiom)
  2. fig. to share meager resources and support each other in times of difficulty

CEDICT

  1. (figurative) to help each other pull through a crisis; mutual help when both are in humble situations
  2. (figurative, of a loving couple) to accompany each other through times of prosperity and hardships till the end of time
  3. to accompany each other through times of prosperity and hardships till the end of time
  4. to help each other pull through a crisis; mutual help when both are in humble situations

Wiktionary

泉水乾涸，鱼儿以口沫互相润溼。语出《庄子．大宗师》：「泉涸，鱼相与处于陆，相呴以溼，相濡以沫。」比喻人同处于困境，而互相以微力救助。也作「濡沫涸辙」、「以沫相濡」。

重編國語辭典

Entry Composition

1 相 xiāng
  1. each other
  2. one another
  3. mutually
  4. fret on the neck of a pipa 琵琶 pípa (a fret on the soundboard is called a 品 pǐn)
2 濡 rú
  1. dilatory
  2. to moisten
=3 以 yǐ old variant of 以 yǐ
=3 以 yǐ old variant of 以 yǐ
=3 以 yǐ
  1. to use
  2. by means of
  3. according to
  4. in order to
  5. because of
  6. at (a certain date or place)
4 沫 mò
  1. foam
  2. suds