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Jyutping coi2 tau4
Pinyin cǎi tou

Definitions (Wiktionary)
  1. noun, Min-Nan
    sign; omen; portent
    (syn.) 征候, 彩头, 衣食, 節嵌, 徵兆, 征兆, 萌, 徵象, 节嵌, 兆头, 預兆, 预兆, 朕兆, 前兆, 彩頭, 徵候, 征象, 先兆, 兆頭
  2. noun
    good luck in business, contests, or lotteries

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Jyutping coi2 tau4
Pinyin cǎi tóu

Definitions (CC-CEDICT)
  1. good omen
  2. good luck (in business etc)
  3. profits (gained in gambling, lottery etc)
Definitions (Wiktionary)
  1. noun, Min-Nan
    sign; omen; portent
    (syn.) 征候, 彩头, 衣食, 節嵌, 徵兆, 征兆, 萌, 徵象, 节嵌, 兆头, 預兆, 预兆, 朕兆, 前兆, 彩頭, 徵候, 征象, 先兆, 兆頭
  2. noun
    good luck in business, contests, or lotteries
Examples (粵典–words.hk)
  1. Cantonese
    中六合彩头奖又冇我份。
    中六合彩頭獎又冇我份。
    zung3 luk6 hap6 coi2 tau4 zoeng2 jau6 mou5 ngo5 fan2.
    • As usual, I don't have the luck to win the jackpot of the Mark Six lottery.
  2. Cantonese
    今期六合彩头奖两注中,每注派彩八千四百几万。
    今期六合彩頭獎兩注中,每注派彩八千四百幾萬。
    gam1 kei4 luk6 hap6 coi2 tau4 zoeng2 loeng5 zyu3 zung3, mui5 zyu3 paai3 coi2 baat3 cin1 sei3 baak3 gei2 maan6.
    • Two winners share the latest Mark Six jackpot, each winning more than HK$84 million.