Definition of torch:
(n) :
a
stick with a
flame on one end used as a light source; a portable source of
electric light
"the mob of angry villagers carried torches and pitchforks to the vampire's castle."
(v) :
to set
fire to, especially using a torch (1) above
"some hoodlums had torched a derelict automobile, which emitted a ghastly pall of thick, black smoke that filled the street."