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Jyutping sim2 teoi3
Pinyin shǎn tuì

Definitions (Wiktionary)
  1. verb, of an application
    to crash and exit unexpectedly

閃退 [闪-]

Jyutping
Pinyin shǎn tuì

Definitions (CC-CEDICT)
  1. (of a mobile app) to crash on startup
  2. to crash