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Jyutping dong1 sin1
Pinyin dāng xiān

Definitions (Wiktionary)
  1. adv, literary
    to take the lead in
  2. adv, literary
    originally; at first
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    我行开一阵,你顶住当先。
    我行開一陣,你頂住當先。
    ngo5 haang4 hoi1 jat1 zan6, nei5 ding2 zyu6 dong3 sin1.
    • I'll be away for a short while. Could you please stand in for me?
  2. Cantonese
    呢间公司一马当先推出咗智能手表。
    呢間公司一馬當先推出咗智能手錶。
    • The company takes the lead to introduce the first smart watch.
Examples (Wiktionary)
  1. Mandarin
    袁绍当先赶来,不到五里,只听得山背后喊声大起,闪出一彪人马,为首三员大将,乃是刘玄德、关云长、张翼德。
    袁紹當先趕來,不到五里,只聽得山背後喊聲大起,閃出一彪人馬,為首三員大將,乃是劉玄德、關雲長、張翼德。
    yuán shào dāng xiān gǎn lái , bù dào wǔ lǐ , zhǐ tīng dé shān bèi hòu hǎn shēng dà qǐ , shǎn chū yī biāo rén mǎ , wèi shǒu sān yuán dà jiāng , nǎi shì liú xuán dé , guān yún cháng , zhāng yì dé .
    • Yuan Shao led the charge in pursuit of the enemy; he had not gone more than five li, when all one could hear was a roar of shouting voices from behind a hill. A group of men and horses came out of nowhere, with three generals in the lead. It was none other than Liu Xuande, Guan Yunchang and Zhang Yide.