Meaning of combust
Definition of combust
(verb)
cause to burn or combust; "The sun burned off the fog"; "We combust coal and other fossil fuels"
start to burn or burst into flames; "Marsh gases ignited suddenly"; "The oily rags combusted spontaneously"
get very angry and fly into a rage; "The professor combusted when the student didn't know the answer to a very elementary question"; "Spam makes me go ballistic"