From Longman Dictionary of Contemporary Englishfire somebody ↔ up phrasal verbto make someone become very excited, interested, or angry It was alarming the way she got so fired up about small things.Grammar Fire up is usually passive. → fire→ See Verb table
Examples from the Corpus
fire up• Many packaging materials contain highly flammable substances that could make a fire suddenly flare up.• She crossed to the fireplace, and put some more coal on the fire.• The fire sent up a huge cloud of smoke visible from San Francisco, 40 miles to the south.• You got the fire way up high.• Then, they were braking to a skidding halt as the towering framework of the fire escape loomed up out of the mist.• NonimmediateLight a fire, build up the steam, turn on a switch, and a linear system awakens.• Wycliffe looked up at the first tier of planks; the shot must have been fired from up there.• The fire flared up with salty blue flames and the driftwood crackled and spat. 