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Jyutping m4 hiu2
Pinyin wú xiǎo

Definitions (Wiktionary)
  1. verb, Cantonese, Hakka, Teochew
    to be unable to; to not know how to
    (syn.) 𣍐₁, 唔會, 勿會, 𣍐₂, 唔識, 無識, 唔識得, 無捌, 𣍐曉得, 沒懂, 𣍐曉, 不曉得, 唔曉, 否會, 不會, 唔奔, 無會, 不懂得

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Jyutping m4 hiu2
Pinyin n2 xiǎo

Definitions (CC-CANTO)
  1. don't know/ understand
Examples (粵典–words.hk)
  1. Cantonese
    洗樖菜都搞咁耐,你到底晓唔晓煮饭㗎?
    洗樖菜都搞咁耐,你到底曉唔曉煮飯㗎?
    sai2 po1 coi3 dou1 gaau2 gam3 noi6, nei5 dou3 dai2 hiu2 m4 hiu2 zyu2 faan6 gaa3?
    • You took ages to wash the vegetables. Do you actually know how to cook?