Use the adjective ablaze to describe something that's on fire. Once your campfire is ablaze, you can toast marshmallows over it.

If there's a terrible fire in your town, it might set many houses ablaze, and some people dispose of fallen leaves and branches by setting them ablaze in the yard. The word dates from the 14th century, and it combines the prefix a-, which here means "on," and blaze, or "flame," from the Old English bl├Žse, "torch, flame, firebrand, or lamp."

Definitions of ablaze

adj lighted up by or as by fire or flame

“forests set ablaze (or afire) by lightning”
afire, aflame, aflare, alight, on fire
lighted, lit
set afire or burning

adj resembling flame in brilliance or color

“maple trees ablaze in autumn”
colorful, colourful
having striking color

adj lighted with red light as if with flames

“streets ablaze with lighted Christmas trees”
inflamed, reddened
characterized by or emitting light

adj keenly excited (especially sexually) or indicating excitement

“"his face all ablaze with excitement"- Bram Stoker”
aflame, aroused
having or expressing strong emotions

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