on fire

phrase

1

: being consumed by fire : aflame

The house was on fire.

2

: performing exceedingly well

Bank stocks are on fire after a round of better-than-expected reports.

—MarketBeat.com

Of late, center Sami Kelleher and wing Abby Gendron have been on fire. The two have combined for 30 points over the last six games …

—Matt Williams

3

: eager, burning

He was on fire with enthusiasm.