篳路藍縷 [筚－蓝缕]

Jyutping bat1 lou6 laam4 leoi5
Pinyin bì lù lán lǚ

Definitions (CC-CEDICT)
  1. the hardships of beginning an undertaking (idiom)
Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic, of a pioneer
    braving hardships and difficulties in beginning an undertaking
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）