"conflagrate" in the verb sense
1. kindle, enkindle, conflagrate, inflame
cause to start burning
"The setting sun kindled the sky with oranges and reds"
2. erupt, ignite, catch fire, take fire, combust, conflagrate
start to burn or burst into flames
"Marsh gases ignited suddenly"
"The oily rags combusted spontaneously"
Source: WordNet® (An amazing lexical database of English)
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