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Jyutping jau4 tau4
Pinyin yóu tóu

Definitions (Wiktionary)
  1. noun
    pretext; excuse; justification
    (syn.) 口實, 擋箭牌, 事由, 口实, 盾牌, 头由, 推頭, 挡箭牌, 托词, 託詞, 題目, 頭由, 藉口, 幌子, 题目, 借口
  2. adv, Cantonese
    from the beginning; from zero

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Jyutping jau4 tau4
Pinyin yóu tou

Definitions (CC-CEDICT)
  1. pretext
  2. excuse
  3. justification
  4. reason
Definitions (粵典–words.hk)
  1. 副詞
    由​一開​始​嗰​度
    from the beginning
    • 我哋由頭嚟過再試一次吖。
      我哋由头嚟过再试一次吖。
      ngo5 dei6 jau4 tau4 lei4 gwo3 zoi3 si3 jat1 ci3 aa1.
      Let’s try again from the beginning.
Definitions (Wiktionary)
  1. noun
    pretext; excuse; justification
    (syn.) 口實, 擋箭牌, 事由, 口实, 盾牌, 头由, 推頭, 挡箭牌, 托词, 託詞, 題目, 頭由, 藉口, 幌子, 题目, 借口
  2. adv, Cantonese
    from the beginning; from zero
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Cantonese-English)
  1. Cantonese
    唔该你将个故事由头到尾讲晒俾我地听。
    唔該你將個故事由頭到尾講晒俾我地聽。
    m4 goi1 nei5 zoeng3 go3 gu3 si6 jau4 tau4 dou3 mei5 gong2 saai3 bei2 ngo5 dei6 ting1 。
    • Tell us the story from beginning to end.
Examples (粵典–words.hk)
  1. Cantonese
    我哋由头嚟过再试一次吖。
    我哋由頭嚟過再試一次吖。
    ngo5 dei6 jau4 tau4 lei4 gwo3 zoi3 si3 jat1 ci3 aa1.
    • Let’s try again from the beginning.
  2. Cantonese
    由头讲起
    由頭講起
    jau5 tau4 gong2 hei2
    • to tell (a story) from the very beginning
  3. Cantonese
    不如我哋由头嚟过。
    不如我哋由頭嚟過。
    bat1 jyu4 ngo5 dei6 jau4 tau4 lai4 gwo3.
    • Let's start over again.