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Jyutping mei6 cang4 si6
Pinyin wèi céng shì

Definitions (Wiktionary)
  1. intj, Xiamen, Zhangzhou-Hokkien
    wait; be slow; just a second
  2. verb, Xiamen, Zhangzhou-Hokkien
    to wait a moment; not so soon; not so fast
    (syn.) 慢才是, 且慢, 未捌是, 未是