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Jyutping daa2 dai2
Pinyin dǎ dǐ

Definitions (CC-CEDICT)
  1. to lay a foundation (also fig.)
  2. to make a first sketch
  3. to eat sth before drinking
  4. to apply an undercoat
Definitions (粵典–words.hk)
  1. 動詞
    喺​食​或者​飲​某​啲​嘢​、​出去​飲酒​、​食飯​之前​,​預先食​或者​飲定​啲​嘢​先
    to eat sth before eating or drinking sth else or before going to a banquet or gathering, etc
    • 飲酒之前最好飲啲牛奶打底,噉就冇咁容易醉。
      饮酒之前最好饮啲牛奶打底,噉就冇咁容易醉。
      Before you go drinking it's better to drink some milk beforehand, then you won't become drunk so easily.
    • 屋企好晏先至食飯架,我勸你去佢屋企之前,最好食住啲嘢打定底先嘍。
      屋企好晏先至食饭架,我劝你去佢屋企之前,最好食住啲嘢打定底先喽。
      Their supper is always late, I recommend that you should eat something beforehand before going to her home .
  2. 動詞
    喺​外​層​嘅​衫​褲​入​面​著​另​一​層​衫​褲​,​用​嚟​保暖​或者​防走光​之類
    to wear sth beneath one's normal clothing for warmth or protection, etc.
    • 我着咗件羊毛衫打底,所以好暖。
      我着咗件羊毛衫打底,所以好暖。
      I wear a woollen vest beneath my clothes, so I feel very warm.
Definitions (Wiktionary)
  1. verb
    to lay a foundation
  2. verb, figuratively
    to lay a foundation
  3. verb, Hakka
    to fill up one's stomach
  4. noun, Hakka
    end part of something
    (syn.) 末尾
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    点解你条裤仲短过条打底裤嘅?
    點解你條褲仲短過條打底褲嘅?
    dim2 gaai2 nei5 tiu4 fu3 zung6 dyun2 gwo3 tiu4 daa2 dai2 fu3 ge2?
    • Why your shorts are shorter than your safety shorts?
  2. Cantonese
    饮酒之前最好饮啲牛奶打底,噉就冇咁容易醉。
    飲酒之前最好飲啲牛奶打底,噉就冇咁容易醉。
    • Before you go drinking it's better to drink some milk beforehand, then you won't become drunk so easily.
  3. Cantonese
    我着咗件羊毛衫打底,所以好暖。
    我着咗件羊毛衫打底,所以好暖。
    • I wear a woollen vest beneath my clothes, so I feel very warm.