What is the meaning of combust?

verb

• Cause to burn or combust.
  • usage: "The sun burned off the fog"; "We combust coal and other fossil fuels"
  • synonyms: burn
• Start to burn or burst into flames.
  • usage: "Marsh gases ignited suddenly"; "The oily rags combusted spontaneously"
  • synonyms: erupt, ignite, catch fire, take fire, conflagrate
• Get very angry and fly into a rage.
  • usage: "The professor combusted when the student didn't know the answer to a very elementary question"; "Spam makes me go ballistic"
  • synonyms: flip one's lid, blow up, throw a fit, hit the roof, hit the ceiling, have kittens, have a fit, blow one's stack, fly off the handle, flip one's wig, lose one's temper, blow a fuse, go ballistic
• Cause to become violent or angry.
  • usage: "Riots combusted Pakistan after the U. S. Air attacks on Afghanistan"
• Undergo combustion.
  • usage: "Maple wood burns well"
  • synonyms: burn