Definitions
1.Prepositional phraseBeing burned by fire."If the wind picks up and the flames spread, the whole town could go on fire."
2.Prepositional phraseOverwhelmed with emotion; beside oneself.
3.Prepositional phraseExcited, enthusiastic or passionate.
4.Prepositional phraseDoing very well; achieving good results at a rapid rate."That striker has scored four goals so far – he's on fire!"
5.Prepositional phraseSexually aroused.
6.Prepositional phraseExperiencing a burning-like sensation, especially "the burn" (from buildup of lactic acid)