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Jyutping gap1 zyun2 zik6 haa6
Pinyin jí zhuǎn zhí xià

Definitions (CC-CEDICT)
  1. to develop rapidly after abrupt turn (idiom); dramatic change
Definitions (粵典–words.hk)
  1. 語句
    情況​突然​變差​,​而且​惡化​得​好​快
    to have an adverse drastic change of a condition; literally: to take a sudden turn and develop rapidly
    • 佢停咗藥之後,情況急轉直下。
      佢停咗药之后,情况急转直下。
      keoi5 ting4 zo2 joek6 zi1 hau6, cing4 fong3 gap1 zyun2 zik6 haa6.
      After she stopped taking the medicines, her situation worsened rapidly.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to suddenly and rapidly worsen or deteriorate; to take a turn for the worse
Examples (粵典–words.hk)
  1. Cantonese
    佢停咗药之后,情况急转直下。
    佢停咗藥之後,情況急轉直下。
    keoi5 ting4 zo2 joek6 zi1 hau6, cing4 fong3 gap1 zyun2 zik6 haa6.
    • After she stopped taking the medicines, her situation worsened rapidly.