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Jyutping taai3 jat1
Pinyin tài yī

Definitions (Wiktionary)
  1. name
    The very beginning and reason of everything.
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    你今儿跟平日里不太一样。
    你今兒跟平日裏不太一樣。
    nǐ jīn er gēn píng rì lǐ bù tài yī yàng 。
    • There's something off about you today.
  2. Mandarin
    她当时像老太太一样低著头走路。
    她當時像老太太一樣低著頭走路。
    tā dāng shí xiàng lǎo tài tai yī yàng dī zhù tóu zǒu lù 。
    • She walked with her head down like an old woman.
Examples (粵典–words.hk)
  1. Cantonese
    佢好开心,因为佢太太一索得男。
    佢好開心,因為佢太太一索得男。
    keoi5 hou2 hoi1 sam1, jan1 wai6 keoi5 taai3 taai2 jat1 sok3 dak1 naam4.
    • He is very happy that his firstborn was a boy.