Definitions of combust:

• verb:   cause to become violent or angry

  Example: "Riots combusted Pakistan after the U.S. air attacks on Afghanistan"

• verb:   cause to burn or combust

  Example: "We combust coal and other fossil fuels"

• verb:   undergo combustion
• verb:   start to burn or burst into flames

  Example: "The oily rags combusted spontaneously"

• verb:   get very angry and fly into a rage

  Example: "The professor combusted when the student didn't know the answer to a very elementary question"