To flare up or burst into flames; also used figuratively for emotions or passions suddenly intensifying.
古い家が夜中に燃え上がり、近所に消防車が集まった。
The old house burst into flames in the middle of the night, and fire trucks gathered nearby.
サッカーの勝利でスタジアムの歓声が燃え上がった。
The stadium erupted in cheers after the soccer victory.
彼は演説中に情熱が燃え上がり、聴衆を引き込んだ。
His passion flared up during the speech and drew in the audience.