flash back in the context of explosive vapour

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Senior Member
Context: 'Vapour [of a new type of petrol] may travel considerable distance to source of ignition and flash back.'

I have consulted a few dictionaries about the phrase but none of the definitions listed seems to fit here. What does ‘flash back’ mean exactly in this context? Thanks.
  • Franco-filly

    Senior Member
    English - Southern England
    "and flash back" means "and cause a flashback" See this definition from Lexico.com {UK]
    flashback 2. A flame moving rapidly back through a combustible vapour.

    ‘cooling the area prevented a flashback’
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