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Jyutping hoi1 fo2 ce1
Pinyin kāi huǒ chē

Definitions (Wiktionary)
  1. verb, literally, verb-object
    to drive a train
  2. verb, figuratively, humorous, neologism, slang, verb-object
    to talk dirty
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    离开火车站的时候,我看见一个男人。
    離開火車站的時候,我看見一個男人。
    lí kāi huǒ chē zhàn de shí hou , wǒ kàn jiàn yí gè nán rén 。
    • When I left the train station, I saw a man.
    • Leaving the train station, I saw a man.