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Jyutping wan4 wan4 zai2
Pinyin yún yún zǎi

Definitions (Wiktionary)
  1. adv, Min-Nan
    slowly
    (syn.) 聊聊仔, 定定, 沓沓仔, 勻勻仔是, 慢慢仔, 宽宽仔, 慢慢, 匀匀仔是, 寬寬仔