conflagrate

Verb

• start to burn or burst into flames
  • Marsh gases ignited suddenly
    
  • The oily rags combusted spontaneously
    

• cause to start burning
  • The setting sun kindled the sky with oranges and reds
    

Related words

• Synonyms: 
  erupt , ignite , catch fire , take fire , combust , kindle , enkindle , inflame