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Jyutping mat6 tung1
Pinyin mì tōng

Definitions (Wiktionary)
  1. verb, literary
    to be close to; to almost reach
  2. verb, literary
    to have an illicit connection with the enemy
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    在左边有一条秘密通道。
    在左邊有一條秘密通道。
    zài zuǒ bian yǒu yī tiáo mì mì tōng dào 。
    • There's a secret path on the left.
    • There's a secret passage on the left.
  2. Mandarin
    你知道书架背后藏著一条秘密通道吗?
    你知道書架背後藏著一條秘密通道嗎?
    nǐ zhī dào shū jià bèi hòu cáng zhù yī tiáo mì mì tōng dào ma ?
    • Did you know there was a secret passage hidden behind the bookcase?