on fire

prep_phrase

Being burned by fire. / (idiomatic) Achieving good results at a rapid rate. / (idiomatic) Sexually aroused.

The house is on fire.

意味（1）

Being burned by fire.

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

意味（2）

(idiomatic) Achieving good results at a rapid rate.

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

意味（3）

(idiomatic) Sexually aroused.