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Jyutping hoi1 gun3 hei3
Pinyin kāi guàn qì

Definitions (Wiktionary)
  1. noun
    can opener; tin opener (device used to open tin cans)
    (syn.) 罐頭開仔 GT, 開罐器, 罐頭起子, GT - General Taiwaneseno specific region identified), 罐頭刀