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Jyutping miu5 wui4
Pinyin miǎo huí

Definitions (粵典–words.hk)
  1. 動詞、潮語
    喺​網​絡​上​嘅​社交​平台​或​通訊​軟件​快速​回覆
    to swiftly reply on social media platforms or a direct message; literally: (1-)second reply
    • 邊個揾你啊?緊張到秒回嘅。
      边个揾你啊?紧张到秒回嘅。
      bin1 go3 wan2 nei5 aa3? gan2 zoeng1 dou3 miu5 wui4 ge2.
      Who sent you the message? You care so much that you reply so soon.
Definitions (Wiktionary)
  1. verb, neologism, slang
    to reply in seconds
Examples (粵典–words.hk)
  1. Cantonese
    边个揾你啊?紧张到秒回嘅。
    邊個揾你啊?緊張到秒回嘅。
    bin1 go3 wan2 nei5 aa3? gan2 zoeng1 dou3 miu5 wui4 ge2.
    • Who sent you the message? You care so much that you reply so soon.
  2. Cantonese
    秒回
    秒回
    miu5 wui4
    • to swiftly reply