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Jyutping gan2 jiu3 gwaan1 tau4
Pinyin jǐn yào guān tóu

Definitions (CC-CEDICT)
  1. urgent and important moment (idiom); critical juncture
Definitions (Wiktionary)
  1. noun
    critical juncture; critical moment
Examples (粵典–words.hk)
  1. Cantonese
    到咗紧要关头
    到咗緊要關頭
    dou3 zo2 gan2 jiu3 gwaan1 tau4
    • at a critical juncture