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Jyutping saam1 gok3 muk6
Pinyin sān jiǎo mù

Definitions (Wiktionary)
  1. noun, Min-Nan
    popular name for the eyes of a person whose eyelids cause the visible part of the eye to look roughly triangular (either upwards (正) or downwards (倒)); alleged to make it difficult to see; considered ferocious and malicious in appearance (Zhang Fei had this appearance)
    (syn.) 三角眼