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Jyutping ngau1 ji6 sou2
Pinyin gōu yì sǎo

Definitions (CC-CANTO)
  1. to seduce / hook up with the girlfriend / female partner of a friend [colloquial]
Definitions (粵典–words.hk)
  1. 動詞、俚語
    勾引​朋友​嘅​妻子
    to have an affair with the wife of one's friend; literally: to hook the righteous wife of one's older brother
    • 江湖中人最忌三樣嘢,洗馬檻、着紅鞋、勾義嫂。
      江湖中人最忌三样嘢,洗马槛、着红鞋、勾义嫂。
      gong1 wu4 zung1 jan4 zeoi3 gei6 saam1 joeng6 je5, sai2 maa5 laam2, zoek3 hung4 haai4, ngau1 ji6 sou2.
      There are 3 crimes that triad members hate: to steal from a friend, to be an informer for police, to have an affair with a friend's woman.
  2. 近義詞
    撬牆腳
Examples (粵典–words.hk)
  1. Cantonese
    江湖中人最忌三样嘢,洗马槛、着红鞋、勾义嫂。
    江湖中人最忌三樣嘢,洗馬檻、着紅鞋、勾義嫂。
    gong1 wu4 zung1 jan4 zeoi3 gei6 saam1 joeng6 je5, sai2 maa5 laam2, zoek3 hung4 haai4, ngau1 ji6 sou2.
    • There are 3 crimes that triad members hate: to steal from a friend, to be an informer for police, to have an affair with a friend's woman.
  2. Cantonese
    江湖中人最忌三样嘢,洗马槛、着红鞋、勾义嫂。
    江湖中人最忌三樣嘢,洗馬檻、着紅鞋、勾義嫂。
    • The triad members hates 3 crimes most : to steal from a friend, to be a informer for police, to take a friend's woman.