1、on fire的意思是：adv.着火；起火；在兴头上；非常激动。2、on fire的英英释义是Adjective:lighted up by or as by fire or flame;"forests set ablaze (or afire) by lightning""even the car's tires were aflame""a night aflare with fireworks""candles alight on the tables""houses on fire"。3、on fire的例句是Their house caught fire while they were away.他们不在家时，住宅着火了。