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Jyutping tung1 tin1
Pinyin tōng tiān

Definitions (CC-CANTO)
  1. (verb) disclose; unveil; make known; exceedingly high; exceedingly great
Definitions (粵典–words.hk)
  1. 動詞
    一​啲​本來​係​秘密​嘅​嘢​,​俾​好多​人​知道​咗​而​唔​再​係​秘密
    to be known by many people
    • 佢升職都已經通晒天喇,都唔係啲乜嘢秘密。
      佢升职都已经通晒天喇,都唔系啲乜嘢秘密。
      keoi5 sing1 zik1 dou1 ji5 ging1 tung1 saai3 tin1 laa1, dou1 m4 hai6 di1 mat1 je5 bei3 mat6.
      Everyone already knows about his promotion. It is not a secret at all.
  2. 名詞
    天井​;​建築物​內部​露天​嘅​空​間​(​量​詞​:​個​)
    courtyard; atrium; literally "connect sky"
Definitions (Wiktionary)
  1. verb, figuratively
    to have direct access to the highest authorities
  2. verb, figuratively
    to be exceedingly great
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
  2. 事情搞大了
  3. 事情傳開了 – 事情传开了
  4. 上級知道了 – 上级知道了
Examples (粵典–words.hk)
  1. Cantonese
    我系个通天晓嚟㗎,你问乜我都识。
    我係個通天曉嚟㗎,你問乜我都識。
    ngo5 hai6 go3 tung1 tin1 hiu2 lai4 gaa3, nei5 man6 mat1 ngo5 dou1 sik1.
    • I am omniscient. I can answer whatever you ask.