wildfire

noun
wild*fire \ ˈwī(-ə)ld-ˌfī(-ə)r \
12th century{ds||1||}
  • a sweeping and destructive conflagration especially in a wilderness or a rural area
  • greek fire
  • a phosphorescent glow (such as ignis fatuus or fox fire)

spread like wildfire

idiom
spread like wildfire \
  • to become known very quickly
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