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Jyutping tung1 fung1 bou3 seon3
Pinyin tōng fēng bào xùn

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
    通風報信

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Jyutping tung1 fung1 bou3 seon3
Pinyin tōng1feng bào xùn

Definitions (CC-CANTO)
  1. to divulge secret information [written and colloquial]