祸不单行

禍不單行
huòbùdānxíng
  1. misfortune does not come singly (idiom)
  2. it never rains but it pours

CEDICT

misfortunes never come singly; it never rains but it pours

Wiktionary

比喻不幸的事接二连三的发生。

重編國語辭典

Entry Composition

=1 祸 huò old variant of 祸 huò
=1 祸 huò
  1. disaster
  2. misfortune
  3. calamity
2 不单 bùdān
  1. not the only
  2. not merely
  3. not simply
3 行 xíng
  1. (bound form) to walk; to go; to travel
  2. (literary) trip; journey; visit
  3. (bound form) temporary; makeshift
  4. (bound form) current; in circulation
  5. (bound form) to do; to perform
  6. capable; competent
  7. all right; OK!; will do
  8. behavior; conduct (Taiwan pr. xìng)
  9. (literary) about to; soon