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Jyutping sei3 ngaan5 gau2
Pinyin sì yǎn gǒu

Definitions (CC-CANTO)
  1. an insulting phrase to address people who wear glasses; dogs, such as Rottweiler, Doberman
Definitions (Wiktionary)
  1. noun, derogatory, regional
    bespectacled person; someone who wears glasses, especially a young person; four-eyes
    (syn.) 四眼狗 pejorative, 四眼佬, 四眼田雞, 四眼妹 girl, 四眼兒狗, 四眼兒, 四眼婆 woman, 四眼龜 pejorative, 四眼佬 man, 架樑, 四眼兒狗 pejorative, 四隻眼 pejorative, 四眼仔 boy