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Jyutping gaa1 dai2
Pinyin jiā dǐ

Definitions (CC-CANTO)
  1. to add staple food / bulk to a meal; to top up the soup base
Definitions (粵典–words.hk)
  1. 動詞、術語、香港
    餐廳​落單​指示​,​加多​啲​白飯​或者​粉​麪​,​配料​或者​餸​菜​唔​會​加​多​;​茶餐​廳​或​粉​麪​鋪​常用​術語
    meal order instruction, to increase the portion of rice or noodles, it doesn't apply to meat or vegetables, a jargon from Hong Kong-style cafe; literally "to add bottom"
    • 一個叉雞飯加底行街 唔該!
      一个叉鸡饭加底行街 唔该!
      jat1 go3 caa1 gai1 faan6 gaa1 dai2 haan4 gaai1 m4 goi1
      A BBQ pork and chicken rice take away with additional rice please !
  2. 反義詞
    扣底
Definitions (Wiktionary)
  1. verb, Cantonese, Hong-Kong
    to add rice in a meal (often in cha chaan tengs)
Examples (Tatoeba—Cantonese-English)
  1. Cantonese
    加底吖唔该。
    加底吖唔該。
    gaa1 dai2 aa1 m4 goi1 。
    • I'd like a large portion, please.
    • Please give me a large serving of rice.
Examples (粵典–words.hk)
  1. Cantonese
    一个叉鸡饭加底行街 唔该!
    一個叉雞飯加底行街 唔該!
    jat1 go3 caa1 gai1 faan6 gaa1 dai2 haan4 gaai1 m4 goi1
    • A BBQ pork and chicken rice take away with additional rice please !
Examples (Wiktionary)
  1. Cantonese
    加底
    加底
    gaa1 dai2
    • to add rice in a meal