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Jyutping lou5 bun2 hong4
Pinyin lǎo běn xíng

Definitions (粵典–words.hk)
  1. 名詞
    專長​而​又​有經​驗​嘅​行​業
    the business or profession in which one is experienced
    • 佢轉過幾次行,都係做唔嚟,最後都做返老本行。
      佢转过几次行,都系做唔嚟,最后都做返老本行。
      keoi5 zyun3 gwo3 gei2 ci3 hong4, dou1 hai6 zou6 m4 lai4, zeoi3 hau6 dou1 zou6 faan1 lou5 bun2 hong4.
      He switched jobs a few times, but never got the hang of any of them, so he went back to his old job.

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Jyutping lou5 bun2 hong4
Pinyin lǎo běn háng

Definitions (CC-CANTO)
  1. one's own profession that one is principally been engaged in; one's line of work
Examples (粵典–words.hk)
  1. Cantonese
    佢转过几次行,都系做唔嚟,最后都做返老本行。
    佢轉過幾次行,都係做唔嚟,最後都做返老本行。
    keoi5 zyun3 gwo3 gei2 ci3 hong4, dou1 hai6 zou6 m4 lai4, zeoi3 hau6 dou1 zou6 faan1 lou5 bun2 hong4.
    • He switched jobs a few times, but never got the hang of any of them, so he went back to his old job.
Examples (Wiktionary)
  1. Mandarin
    老本行
    老本行
    lǎo běn háng
    • original profession