godan verb (-ru), intransitive verb
flare up; burst into flames
Describes something suddenly catching fire and burning strongly, often with upward movement. Also used figuratively for emotions or situations intensifying rapidly.
乾いた木が一瞬で燃え上がった。
The dry wood flared up in an instant.
彼の怒りが燃え上がっ
His anger flared up.