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Jyutping tau1 bun6 zi2
Pinyin tōu pàn zi

Definitions (Wiktionary)
  1. adv, Wu
    in secret; secretively; stealthily; without being detected
    (syn.) 偷畔, 阴区区, 静悄悄, 偷偷, 悄悄, 暗暗, 悄悄咪咪, 阴梭阳梭, 陰梭陽梭, 靜悄悄, 陰區區, 陰悄悄, 阴悄悄