Wiktionary
vb. 1 (context intransitive followed by to English) to light using fire. 2 (en-pastset fire)
Usage examples of "set fire".
The sect, linked to the cargo cults which were once a mainstay of island life, doused their clothes and bodies with gasoline and set fire to themselves in the main boarding area of Port Moresby's Somare Airport.
The mast snapped like a sapling in a tornado, and the ship staggered aside as the flaming remnants of its mainsail set fire to her standing rigging.
They set fire to houses and threatened to burn all the village if I did not come out to them.
A ragged band of survivors set fire to stacked logs, while other men chipped through the resulting slush with swords and shovels.
The Terrasphere had been covered with dry branches and bark to which the warriors had set fire.
They ran into resistance at Nish, when a Salamander seized control of some of the knights, who in their anger set fire to houses and farms.
They then set fire to the hut, and the whole party are burned together.