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Jyutping on3 kau3
Pinyin èn kòu

Definitions (Wiktionary)
  1. noun, colloquial
    snap fastener; popper
    (syn.) 噼噼仔, 鉛鈕, 搭扣, 子母扣, 壓扣, 捺子, 按扣, 夾扣, 捺紐, 喼紐 dated, 捺鈕, 公婆紐子, 則紐, 撳紐, 紐扣, 按扣兒, 捺扣, 啪紐, 抶紐, 合紐仔, 公婆扣子, 摁扣兒, 落扣, 子母扣兒, 搭紐, 鬥紐, 鬥仔, 夾紐