热火朝天 rèhuǒcháotiān bustling with activity Origin Definitions Defs Strokes Stroke Words Sentences Sents 热火 熱火 rèhuǒ flame a blazing fire or hot flame; often used to symbolize passion or intense emotion朝 cháo preposition toward facing; toward; in the direction of天 tiān noun sky sky; heavens; the space above the earth