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Jyutping lou4 sou1
Pinyin láo sao

Definitions (Wiktionary)
  1. verb
    to complain; to grumble; to be discontented
    (syn.) 叨唠, 發牢騷, 发牢骚, 怨怼, 怨叹, 怨嘆, 抱怨, 叨嘮, 怨懟, 吐槽, 埋怨
  2. noun
    complaint; grumble; discontent
    (syn.) 怨言

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Jyutping lou4 sou1
Pinyin láo sāo

Definitions (CC-CEDICT)
  1. discontent
  2. complaint
  3. to complain
Definitions (粵典–words.hk)
  1. 名詞
    不滿​、​怨憤
    grumble; growl; discontent, having grievances, complaints
    • 發太多牢騷對個會議冇幫助。
      发太多牢骚对个会议冇帮助。
      Grumbling too much is not helpful to the conference.
Definitions (Wiktionary)
  1. verb
    to complain; to grumble; to be discontented
    (syn.) 叨唠, 發牢騷, 发牢骚, 怨怼, 怨叹, 怨嘆, 抱怨, 叨嘮, 怨懟, 吐槽, 埋怨
  2. noun
    complaint; grumble; discontent
    (syn.) 怨言
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
    他总是牢骚满腹。
    他總是牢騷滿腹。
    tā zǒng shì láo sāo mǎn fù 。
    • He's always dissatisfied.
  3. Mandarin
    每人心里都有牢骚。
    每人心裏都有牢騷。
    měi rén xīn li dōu yǒu láo sāo 。
    • Everyone has something that's troubling him.
  4. 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.
  5. 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
    发太多牢骚对个会议冇帮助。
    發太多牢騷對個會議冇幫助。
    • Grumbling too much is not helpful to the conference.
  2. 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.
Examples (Wiktionary)
  1. Mandarin
    牢骚
    牢騷
    láo sāo
    • to be discontented