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Jyutping faat3 fan5 tou4 koeng4
Pinyin fā fèn tú qiáng

Definitions (CC-CEDICT)
  1. to make an effort to become strong (idiom); determined to do better
  2. to pull one's socks up
Definitions (粵典–words.hk)
  1. 動詞
    決心​努力​以求​變得​強大
    to work with a will to be strong
  2. 參看
    發憤圖強
Definitions (Wiktionary)
  1. phrase, idiomatic
    to work diligently (ex. to make the country strong)