Definition of "on fire" in English

Prepositional phrase

1. Being burned by fire.

   • If the wind picks up and the flames spread, the whole town could go on fire.

2. Overwhelmed with emotion; beside oneself.

3. Excited, enthusiastic or passionate.

4. Doing very well; achieving good results at a rapid rate.

   • That striker has scored four goals so far – he's on fire!

5. Sexually aroused.

6. Experiencing a burning-like sensation, especially "the burn" (from buildup of lactic acid)