靈機一觸 [灵机－触]

Jyutping ling4 gei1 jat1 zuk1
Pinyin líng jī yī chù

Definitions (CC-CANTO)
  1. epiphany; sudden inspiration (spoken)
Definitions (粵典–words.hk)
  1. 語句
    心思​忽然​有所​領悟
    in a spark of brilliance