combust

1. 1. To catch fire; burst into flame: The fire started when a pile of oily rags spontaneously combusted.
   2. To undergo combustion; burn: As the fuels were combusting they gave off noxious vapors.
2. To become suddenly angry or agitated: The defendant combusted when he heard the verdict.

1. To cause to burn; ignite.
2. To cause to become angry or violent: riots that are combusting whole provinces.

[Back-formation from COMBUSTION.]

verb

To undergo combustion: blaze, burn, flame, flare. See hot/cold/lukewarm.

The verb has 5 meanings:

Meaning #1: cause to burn or combust
  Synonym: burn

Meaning #2: start to burn or burst into flames
  Synonyms: ignite, erupt, catch fire, take fire, conflagrate

Meaning #3: blow one's stack; fly off the handle, flip one's wig; lose one's temper; blow a fuse
  Synonyms: blow up, throw a fit

Meaning #4: cause to become violent or angry

Meaning #5: undergo combustion
  Synonym: burn