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Jyutping jat1 coeng4 hung1
Pinyin yī cháng kōng

Definitions (CC-CEDICT)
  1. all one's hopes and efforts come to nothing
  2. futile
Definitions (粵典–words.hk)
  1. 語句
    冇​任何​收​穫​,​徒​勞無功​,​乜​都​冇
    to end up with nothing, to have gained nothing, to do something without result
    • 練拳不練功,到老一場空。
      练拳不练功,到老一场空。
      lin6 kyun2 bat1 lin6 gung1, dou3 lou5 jat1 coeng4 hung1
      If you practice only the form of martial art but never build up your strength, you will gain nothing when you turn old.
  2. 近義詞
    得個桔
Definitions (Wiktionary)
  1. noun, idiomatic
    all of one's hopes and efforts coming to nothing
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    练拳不练功,到老一场空。
    練拳不練功,到老一場空。
    lin6 kyun2 bat1 lin6 gung1, dou3 lou5 jat1 coeng4 hung1
    • If you practice only the form of martial art but never build up your strength, you will gain nothing when you turn old.
  2. Cantonese
    一场空
    一場空
    jat1 coeng4 hung1
    • to end up with nothing; all gone in vain
  3. Cantonese
    一场空袭,死左十个平民。
    一場空襲,死左十個平民。
    jat1 coeng4 hung1 zaap6, sei2 zo2 sap6 go3 ping4 man4.
    • 10 civilians were killed in just one air raid.