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Jyutping gu1 aa1
Pinyin gū a

Definitions (Wiktionary)
  1. adv, Zhangzhou-Hokkien
    only; just
    (syn.) 则是, 仅仅, 孤單, 僅僅, 单纯, 俪是, 則是, 只是, 孤单, 干焦, 單純, 徒然, 只, 只系, 只係, 儷是