english
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see SET ON FIRE; SET THE WORLD ON FIRE.
American Heritage Idioms
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Phrase(s): on fire 1. Lit. burning; being burned with flames. • Help! My car is on fire! • That house on the corner is on fire! 2. Sl. very attractive or sexy. • She is really on fire! • Look at those jet-set people! Each one of them is just on fire. 3. Fig. Inf. doing very well; very enthusiastic. • Jill’s new book is really on fire. Everyone is buying it. • Fred is on fire in his new job. He’ll get promoted in no time.
McGrawhill's American Idioms And Phrasal Verbs