不可望其項背 [－－－－项－]

Jyutping bat1 ho2 mong6 kei4 hong6 bui3
Pinyin bù kě wàng qí xiàng bèi

Definitions (Wiktionary)
  1. phrase, idiomatic
    not in the same class; cannot or not be fit to hold a candle to somebody; incomparable