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Jyutping mou4 je6 gau2
Pinyin wú ruò jiǔ

Definitions (Wiktionary)
  1. adv, Min-Nan
    soon; before long; after a while
    (syn.) 俄而, 頃之, 無若久, 無幾久, 唔久, 暫, 不一下兒過, 沒多久, 已而, 頃刻, 少頃, 無偌久, 冇耐, 不久, 既而, 冇幾耐