vi.
突然燃起来，旺起来(常与up连用)：
The fire flared up as the paper caught.
纸着火时突然烧了起来。
(如火在风中)闪耀；闪光；闪亮：
A gust of wind made the torches flare.
一阵风吹得火把闪闪发光。
突然发怒，突然激动；(脾气、激情等)突然爆发(常与 up 或 out 连用)：
Mary's temper flared up.
玛丽大发脾气。
Trouble may flare up in the big cities