Wiktionary
blaze up
vb. 1 (context intransitive of a fire English) To burn more brightly 2 (context intransitive of a fire English) to burst into flames from a seemingly non-burning state
WordNet
Usage examples of "blaze up".
Kade glanced up in horror and saw triumph blaze up on Inosolan's face.
He saw the fierce brightness of hope blaze up in the boy's face, kindling his eyes almost to gold.
And saw the third echo of that flaming heritage blaze up in Brianna's eyes, the only thing alive in her face.
Suddenly, and to his own surprise, Frodo felt a hot wrath blaze up in his heart.
He had seen men blaze up like living flames, seen them die fast and slow, but die nonetheless.