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1. Literally, aflame. The house was on fire for nearly an hour before the fire department finally arrived. He set the contract on fire when he realized what his brother was trying to pull.
2. Having an intense burning sensation. My legs are on fire after that workout! My throat's on fire from this infection—I can't eat or drink a thing!
3. Performing very enthusiastically, adeptly, or successfully. The team has been on fire lately, winning 11 of its last 12 games. I was worried that Sarah wouldn't be able to handled the advanced math class that we moved her into, but she's been on fire this whole semester.
4. Extremely sexy or attractive. Wow babe, you are looking on fire tonight!
1. Lit. burning; being burned with flames. Help! My car is on fire! That house on the corner is on fire!
2. Sl. very attractive or sexy. She is really on fire! Look at those jet-set people! Each one of them is just on fire.
3. Fig. Inf. doing very well; very enthusiastic. Jill's new book is really on fire. Everyone is buying it. Fred is on fire in his new job. He'll get promoted in no time.
on ˈfiregiving you a painful burning feeling: He couldn’t breathe. His chest was on fire.
1. mod. very attractive or sexy. Look at those jet-set people! Each one of them is just on fire.
2. mod. doing very well; very enthusiastic. Fred is on fire in his new job. He’ll get promoted in no time.
1. Ignited; ablaze.
2. Filled with enthusiasm or excitement.