駟馬 [驷马]

Jyutping si3 maa5
Pinyin sì mǎ

Definitions (Wiktionary)
  1. noun, literary
    team of four horses (usually pulling a single carriage)
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    一言既出，驷马难追。
    一言既出，駟馬難追。
    yī yán jì chū ， sì mǎ nán zhuī 。
    • You cannot take back what you have said.