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Jyutping nei4 fung1
Pinyin mí fēng

Definitions (CC-CEDICT)
  1. to sign across the seal (as a precaution against fraud)
Definitions (Wiktionary)
  1. verb
    to seal the examinee’s name on an exam paper (to prevent fraud)
  2. verb
    to seal up
    (syn.) 密封