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Jyutping tung1 fung1 bou3 seon3
Pinyin tōng fēng bào xìn

Definitions (CC-CANTO)
  1. inform secretly (idiom)
Definitions (粵典–words.hk)
  1. 動詞
    將​秘密​或者​情報講​畀​另一方​嘅​人​知
    to leak information to someone not on your side; to share intrigue with others
  2. 參看
    通風報訊
Definitions (Wiktionary)
  1. phrase, idiomatic
    to secretly pass on information to others; to tip somebody off
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    就系佢条二五仔通风报信!
    就係佢條二五仔通風報信!
    zau6 hai6 keoi5 tiu4 ji6 ng5 zai2 tung1 fung1 bou3 seon3!
    • That's the rat who sold us out!
Examples (Wiktionary)
  1. Mandarin
    通风报信
    通風報信
    tōng fēng bào xìn
    • to secretly pass on information to others