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Jyutping tin1 maa5
Pinyin tiān mǎ

Definitions (Wiktionary)
  1. noun, Chinese, literary
    white dog-like beast with a black head, which flies when it sees people
  2. noun, literary
    praying mantis
  3. noun, Chinese, literary
    a star in the Legs mansion
  4. noun, Greek, literary
    Pegasus
  5. noun, Chinese, literary
    mythical horse ridden by the Celestial Emperor
  6. noun, literary
    fine horse
  7. name
    Tianma (a subdistrict of Changshan, Quzhou, Zhejiang, China)

天馬 [-马]

Jyutping
Pinyin tiān mǎ

Definitions (CC-CEDICT)
  1. celestial horse (mythology)
  2. fine horse
  3. Ferghana horse
  4. (western mythology) Pegasus
Examples (粵典–words.hk)
  1. Cantonese
    我知呢个计划系好天马行空,但我信有一日会成功架。
    我知呢個計劃係好天馬行空,但我信有一日會成功架。
    • I know this plan seems very far fetched, but I believe it will succeed one day.
  2. Cantonese
    创作真系可以天马行空,冇限制。
    創作真係可以天馬行空,冇限制。
    • In fact, artistic creations can express ideas freely without constraint.
Examples (Wiktionary)
  1. Mandarin
    没有什么能够阻挡 你对自由的向往 天马行空的生涯 你的心了无牵挂
    沒有什麼能夠阻擋 你對自由的嚮往 天馬行空的生涯 你的心了無牽掛
    méi yǒu shén me néng gòu zǔ dǎng , nǐ duì zì yóu de xiàng wǎng , tiān mǎ xíng kōng de shēng yá , nǐ de xīn liǎo wú qiān guà
    • Nothing could ever stand,
      Between you and the free land;
      In a life of laissez-aller,
      All your worries were blown away.