環環相扣 [环环－－]

Jyutping waan4 waan4 soeng1 kau3
Pinyin huán huán xiāng kòu

Definitions (CC-CEDICT)
  1. closely linked with one another
  2. interlocked
  3. to interrelate
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic, of many things
    to be closely connected