不解之緣

不解之缘
bùjiězhīyuán

unbreakable bond

Wiktionary

Entry Composition

1 不解 bùjiě
  1. to not understand
  2. to be puzzled by
  3. indissoluble
2 之 zhī
  1. (possessive particle, literary equivalent of 的 de)
  2. him
  3. her
  4. it
=3 緣 yuán
  1. cause
  2. reason
  3. karma
  4. fate
  5. predestined affinity
  6. margin
  7. hem
  8. edge
  9. along
=3 緣 yuàn
  1. (obsolete on its own in Standard Chinese) to edge with lace; to rim with lace, border, etc.
  2. hem; margin
  3. to edge with lace; to rim with lace, border, etc.