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Jyutping cyun3 bou6 bat1 joeng6
Pinyin cùn bù bù ràng

Definitions (Wiktionary)
  1. phrase, idiomatic
    to not make to slightest concession; to not yield even slightly
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)

寸步不讓 [---让]

Jyutping
Pinyin cùn bù bù ràng

Definitions (CC-CEDICT)
  1. (idiom) not to yield an inch