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Jyutping fai1 saa2 zi6 jyu4
Pinyin huī sǎ zì rú

Definitions (粵典–words.hk)
  1. 形容詞
    對​一種​技巧​非常​熟識​,​完全​掌握​並且​可以​活​用
    to do something with great facility, smoothly
    • 佢玩呢隻射擊 Game 玩到揮灑自如,次次都可以秒殺對手。
      佢玩呢只射击 Game 玩到挥洒自如,次次都可以秒杀对手。
      yue:佢玩呢隻射擊 Game 玩到揮灑自如,次次都可以秒殺對手。
      He is very proficient in the shooting game that he could kill every enemies in sight instantly.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to write or paint without constraint; to be skilful in writing, calligraphy, or painting

揮灑自如 [挥洒--]

Jyutping
Pinyin huī sǎ zì rú

Definitions (CC-CEDICT)
  1. (idiom) to do (sth) with great aplomb
Examples (粵典–words.hk)
  1. Cantonese
    佢玩呢只射击 Game 玩到挥洒自如,次次都可以秒杀对手。
    佢玩呢隻射擊 Game 玩到揮灑自如,次次都可以秒殺對手。
    yue:佢玩呢隻射擊 Game 玩到揮灑自如,次次都可以秒殺對手。
    • He is very proficient in the shooting game that he could kill every enemies in sight instantly.