Might mean (unverified): Sudden increase in flame intensity.
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We found one dictionary that defines the word upflash:

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  1. upflash: Wiktionary

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Definitions from Wiktionary (upflash)

▸ verb:  (intransitive) To flash upward; to rise or surface very rapidly.

Similar:
upflare, flash up, upfling, flash, fulgurate, flare up, upsplash, flash over, uprush, snap, more...

Opposite:
downplay, understate, minimize, diminish, de-emphasize

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Similar:
upflare, flash up, upfling, flash, fulgurate, flare up, upsplash, flash over, uprush, snap, more...

Opposite:
downplay, understate, minimize, diminish, de-emphasize



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