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Jyutping gong1 zi2
Pinyin gǎng zi

Definitions (Wiktionary)
  1. noun
    ridge; wale; welt
  2. noun
    hillock; mound

崗子 [岗-]

Jyutping
Pinyin gǎng zi

Definitions (CC-CEDICT)
  1. mound; hillock
  2. welt (on the skin); ridge (on the road surface etc)