Four-dots fire radical at the bottom — flame form of
火, marking heat and combustion from below. Carries the meaning of
烈: intense fire, fierce blaze, by extension intense in any sense — passionate, severe, heroic. Sits with
热 hot,
煮 boil,
焦 scorched,
烈士 (a martyr, literally 'fire-fierce gentleman'). The flames lick upward from underneath.