偏勞 [－劳]

Jyutping pin1 lou4
Pinyin piān láo

Definitions (CC-CEDICT)
  1. undue trouble
  2. Thank you for having gone out of your way to help me.
Definitions (Wiktionary)
  1. verb
    to give someone undue trouble (used when asking somebody for help or thanking somebody for his help)
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）