On-beornan

According to the Old English Dictionary:

-brinnan;

on-beornan

pp. -burnen. I. to set fire to, to kindle :-- Abraham ádfýr onbran, Cd. Th. 203, 4; Exod. 398. II. to inflame :-- Se innoþ wyrþ onburnen, Lchdm. ii. 278, 9. Wǽte onburnenu, 218, 14. on-beornan