其利斷金 [－－断－]

Jyutping kei4 lei6 dyun3 gam1
Pinyin qí lì duàn jīn

Definitions (粵典–words.hk)
  1. 語句
    形容​團​結​嘅​力量​就​好似​鋒​利​嘅​刀​劍​，​可以​切斷​金屬​。
    their sharpness can cut through metal