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Jyutping hoi1 saan1 zi2
Pinyin kāi shān zi

Definitions (Wiktionary)
  1. noun, Xiang, euphemistic
    axe (tool)
    (syn.) 斧頭, 貓耳, 開山子, 斧子, 大斧, 斧, 貓頭, 開山兒, 手斧, 開山