一語成讖 [－语－谶]

Jyutping jat1 jyu5 sing4 cam3
Pinyin yī yǔ chéng chèn

Definitions (粵典–words.hk)
  1. 語句、書面語
    有意​無意講​咗​啲​唔​吉利​嘅​嘢​，​點​知事​後​真​係​發生​咗
    an unconscious comment or joke unfortunately becomes a prophecy to an undesirable incident by accident; literally, the line becomes a prophecy
  2. 近義詞
    烏鴉口
Definitions (Wiktionary)
  1. phrase, idiomatic
    one's careless words (inauspiciously) turned out to be a prophecy
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）

一語成讖 [－语－谶]

Jyutping jat1 jyu5 sing4 caam3
Pinyin yī yǔ chéng chèn

Definitions (粵典–words.hk)
  1. 語句、書面語
    有意​無意講​咗​啲​唔​吉利​嘅​嘢​，​點​知事​後​真​係​發生​咗
    an unconscious comment or joke unfortunately becomes a prophecy to an undesirable incident by accident; literally, the line becomes a prophecy
  2. 近義詞
    烏鴉口

一語成讖 [－语－谶]

Jyutping
Pinyin yī yǔ chéng chèn

Definitions (CC-CEDICT)
  1. (idiom) to have one's words turn out to be (tragically) prophetic
Examples (粵典–words.hk)
  1. Cantonese
    一语成谶
    一語成讖
    • an unfortunate prophecy that was fulfilled