萍水相逢

píngshuǐxiāngféng
strangers coming together by chance (idiom)

CEDICT

Entry Composition

1 萍 píng duckweed
2 水相 shuǐxiàng aqueous solution
3 逢 féng
  1. to meet by chance
  2. to come across
  3. (of a calendar event) to come along
  4. (of an event) to fall on (a particular day)
  5. to fawn upon