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Jyutping miu5 dung2
Pinyin miǎo dǒng

Definitions (Wiktionary)
  1. verb, neologism, slang
    “to understand in a second”; to understand immediately

秒懂 [--]

Jyutping
Pinyin miǎo dǒng

Definitions (CC-CEDICT)
  1. to understand instantly