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Jyutping paak1 nau2
Pinyin pā niǔ

Definitions (Wiktionary)
  1. noun, Cantonese, Hakka, dialectal
    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

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Jyutping baak1 nau2
Pinyin pā niǔ

Definitions (CC-CANTO)
  1. to snap buttons