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Jyutping faat3 jyun5
Pinyin fā ruǎn

Definitions (CC-CEDICT)
  1. to weaken
  2. to go soft (at the knees)
Definitions (粵典–words.hk)
  1. 動詞
    身體​乏力
    to be weak; to be out of energy
    • 佢畀隻曱甴嚇到對腳發軟。
      佢畀只曱甴吓到对脚发软。
      keoi5 bei2 zek3 gaat6 zaat2 haak3 dou3 deoi3 goek3 faat3 jyun5.
      His legs felt like jelly when he saw the cockroach.
Examples (粵典–words.hk)
  1. Cantonese
    佢惊得滞,发软蹄跪低咗。
    佢驚得滯,發軟蹄跪低咗。
    keoi5 geng1 dak1 zai6, faat3 jyun5 tai4 gwai6 dai1 zo2.
    • Too frightened, he went weak at the knees and knelt down.
  2. Cantonese
    佢畀只曱甴吓到对脚发软。
    佢畀隻曱甴嚇到對腳發軟。
    keoi5 bei2 zek3 gaat6 zaat2 haak3 dou3 deoi3 goek3 faat3 jyun5.
    • His legs felt like jelly when he saw the cockroach.
Examples (Wiktionary)
  1. Mandarin
    她的两腿发软。
    她的兩腿發軟。
    tā de liǎng tuǐ fā ruǎn .
    • Her legs felt weak.