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Jyutping faat3 lou4 sou1
Pinyin fā láo sao

Definitions (Wiktionary)
  1. verb, verb-object
    to complain; to whinge; to nag; to grumble; to be grouchy
    (syn.) 叨唠, 怨怼, 牢騷, 怨叹, 怨嘆, 牢骚, 抱怨, 叨嘮, 怨懟, 吐槽, 埋怨

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Jyutping faat3 lou4 sou1
Pinyin fā láo sāo

Definitions (CC-CEDICT)
  1. to whine
  2. to be grouchy
Definitions (粵典–words.hk)
  1. 動詞
    提出​不滿​,​但​係​實際​上​冇​乜​幫助
    to grumble with discontent; to complain
    • 你可以喺電台節目發牢騷。
      你可以喺电台节目发牢骚。
      You can make complaints on radio programmes.
  2. 近義詞
Definitions (Wiktionary)
  1. verb, verb-object
    to complain; to whinge; to nag; to grumble; to be grouchy
    (syn.) 叨唠, 怨怼, 牢騷, 怨叹, 怨嘆, 牢骚, 抱怨, 叨嘮, 怨懟, 吐槽, 埋怨
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    行动比语言更有说服力。别发牢骚多做事。
    行動比語言更有説服力。別發牢騷多做事。
    xíng dòng bǐ yǔ yán gèng yǒu shuō fú lì 。 bié fā láo sāo duō zuò shì 。
    • Actions speak louder than words. Stop complaining and do it.
  2. Mandarin
    汤姆老是发牢骚。
    湯姆老是發牢騷。
    tāng mǔ lǎo shi fā láo sāo 。
    • Tom complains all the time.
  3. Mandarin
    停止发牢骚吧。
    停止發牢騷吧。
    tíng zhǐ fā láo sāo ba 。
    • Stop grumbling.
Examples (粵典–words.hk)
  1. Cantonese
    你可以喺电台节目发牢骚。
    你可以喺電台節目發牢騷。
    • You can make complaints on radio programmes.