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Jyutping sik1 zi6 tau4 soeng5 jat1 baa2 dou1
Pinyin sè zì tóu shàng yī bǎ dāo

Definitions (Wiktionary)
  1. proverb
    charming beauty makes men fall

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Jyutping sik1 zi6 tau4 soeng6 jat1 baa2 dou1
Pinyin sè zì tóu shàng yī bǎ dāo

Definitions (CC-CEDICT)
  1. lit. there is a knife above the character for lust
  2. fig. lascivious activities can lead to bitter consequences
Definitions (粵典–words.hk)
  1. 語句
    色字​頂​有​近似​刀​字​嘅​部份​,​比喻​色​慾​或​靚​嘅​男女​(​男色​、​女色​)​都​帶​有​殺​傷力​,​一則損​精力​,​一則​亂​心性​,​一則傷​人情
    figuratively, lust or beautiful male/ female can be harmful as a knife, can break the strength, spirit or relationship; literally, Chinese character lust (色 sik1) has a head looks like a knife (刀 dou1)
    • 佢成日掛住睇AV無心機返工,小心色字頭上一把刀呀。
      佢成日挂住睇AV无心机返工,小心色字头上一把刀呀。
      He often spend so much time to watch AV and doesn't put all his attention to his job, beware that lust can be so harmful as a knife.
Examples (粵典–words.hk)
  1. Cantonese
    佢成日挂住睇AV无心机返工,小心色字头上一把刀呀。
    佢成日掛住睇AV無心機返工,小心色字頭上一把刀呀。
    • He often spend so much time to watch AV and doesn't put all his attention to his job, beware that lust can be so harmful as a knife.