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Jyutping bit1 ging1 zi1 lou6
Pinyin bì jīng zhī lù

Definitions (CC-CEDICT)
  1. the road one must follow or take
  2. the only way
  3. same as 必由之路[bi4 you2 zhi1 lu4]
Definitions (粵典–words.hk)
  1. 名詞
    一定​會經​過​嘅​路​(​量​詞​:​條​)
    the only way (to a location)
    • 呢條係去佢學校嘅必經之路,我哋喺度等佢啦。
      呢条系去佢学校嘅必经之路,我哋喺度等佢啦。
      ni1 tiu4 hai6 heoi3 keoi5 hok6 haau6 ge3 bit1 ging1 zi1 lou6, ngo5 dei6 hai2 dou6 dang2 keoi5 laa1.
      This is the only way to school; let's wait for him here.
  2. 名詞
    一定​會經​歷​嘅​嘢​(​量​詞​:​條​)
    something that one will certainly experience
    • 生、老、病、死係人生嘅必經之路。
      生、老、病、死系人生嘅必经之路。
      sang1 lou5 beng6 sei2 hai6 jan4 sang1 ge3 bit1 ging1 zi1 lou6.
      To be born, to age, to be sick and to die are all that humans must experience.
Definitions (Wiktionary)
  1. phrase, idiomatic
    the stage that one must experience to attain a certain goal
  2. phrase, idiomatic
    the route that one must take to reach a particular destination
Examples (粵典–words.hk)
  1. Cantonese
    呢条系去佢学校嘅必经之路,我哋喺度等佢啦。
    呢條係去佢學校嘅必經之路,我哋喺度等佢啦。
    ni1 tiu4 hai6 heoi3 keoi5 hok6 haau6 ge3 bit1 ging1 zi1 lou6, ngo5 dei6 hai2 dou6 dang2 keoi5 laa1.
    • This is the only way to school; let's wait for him here.
  2. Cantonese
    生、老、病、死系人生嘅必经之路。
    生、老、病、死係人生嘅必經之路。
    sang1 lou5 beng6 sei2 hai6 jan4 sang1 ge3 bit1 ging1 zi1 lou6.
    • To be born, to age, to be sick and to die are all that humans must experience.
  3. Cantonese
    必经之路
    必經之路
    bit1 ging1 zi1 lou6
    • the only way