To spread (of flames); to expand widely as a fire grows.
強い風のために火が瞬く間に燃え広がった。
Because of the strong wind, the fire spread in an instant.
建物全体に火が燃え広がり、消火に時間がかかった。
The flames spread throughout the building, and it took time to extinguish them.
新聞は、山火事が数時間で大面積に燃え広がったと伝えた。
The newspaper reported that the wildfire spread over a large area within hours.