淚如雨下

泪如雨下
lèirúyǔxià
tears falling like rain (idiom)

CEDICT

to cry profusely

Wiktionary

哭得非常傷心，淚水如同下雨一般。形容十分傷心。《紅樓夢．第一七、一八回》：「一語未終，淚如雨下。」《老殘遊記二編．第六回》：「環翠因提起他家舊事，未免傷心，不覺淚如雨下，掩面啜泣。」也作「淚下如雨」。

重編國語辭典

形容十分傷心

維基詞典

Entry Composition

1 淚 lèi (bound form) tears; teardrops
2 如雨 rúyǔ
  1. (literary) like rain; in large amounts
  2. like rain; in large amounts
3 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