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Jyutping faai3 sim2
Pinyin kuài shǎn

Definitions (粵典–words.hk)
  1. 動詞
    一班人​約​埋​喺​指定​時間​同地點​集合​,​做​完​特定​動作​之​後​迅速​散​去
    flash mob
    • 快閃遊行
      快闪游行
      faai3 sim2 jau4 hang4
      flash mob march
Definitions (Wiktionary)
  1. noun
    flash memory
    (syn.) 閃存, 闪存
  2. noun, neologism
    flash mob
  3. adj, attributive
    pop-up (retail, store, etc.)

快閃 [-闪]

Jyutping
Pinyin kuài shǎn

Definitions (CC-CEDICT)
  1. to depart as quick as a flash
  2. flash mob
Examples (粵典–words.hk)
  1. Cantonese
    快闪游行
    快閃遊行
    faai3 sim2 jau4 hang4
    • flash mob march