一環扣一環 [－环－－环]

Jyutping jat1 waan4 kau3 jat1 waan4
Pinyin yī huán kòu yī huán

Definitions (Wiktionary)
  1. phrase, idiomatic, of steps in a process
    closely linked
    (syn.) 環環相扣, 环环相扣