on fire

prepositional phrase6

1. •
   Being burned by fire.

   • If the wind picks up and the flames spread, the whole town could go on fire.
2. •
   Doing very well; achieving good results at a rapid rate.

   • That striker has scored four goals so far – he's on fire!
3. •
   Overwhelmed with emotion; beside oneself.
4. •
   Excited, enthusiastic or passionate.
5. •
   Experiencing a burning-like sensation, especially "the burn" (from buildup of lactic acid)
6. •
   (informal) Sexually aroused.