Etymology
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combust (v.)

"to inflame, to burn," late 15c., from Latin combustus, past participle of combuere "to burn up, consume" (see combustion). "Now only jocular or affected" [OED]. Related: Combusted; combusting. Combust was used in Middle English from late 14c. as a past-participle adjective, "burnt," from Old French combust (14c.) and directly from Latin combustus. Also it was an astrological term for planets when near the sun.

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Definitions of combust

combust (v.)
cause to burn or combust;
We combust coal and other fossil fuels
Synonyms: burn
combust (v.)
start to burn or burst into flames;
The oily rags combusted spontaneously
Synonyms: erupt / ignite / catch fire / take fire / conflagrate
combust (v.)
get very angry and fly into a rage;
The professor combusted when the student didn't know the answer to a very elementary question
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
combust (v.)
cause to become violent or angry;
Riots combusted Pakistan after the U.S. air attacks on Afghanistan
combust (v.)
undergo combustion;
Synonyms: burn
From wordnet.princeton.edu