fire up
verb1
To ignite.
- Let's fire up the grill and have a barbecue.
- They're[renewables] not strong enough to fire up the plants that you need to make your country great. The wind doesn't blow. Those big windmills are so pathetic and so bad, so expensive to operate, and they have to be rebuilt all the time and they start to rust and rot.2025 September 23, Donald Trump, speech at United Nations:
2
Of an engine or similar, to start.
- The generator fired up shortly after the power failure began.
3
Computing, Engineering, Mathematics, Natural sciences, Physical sciences, Sciences Informal To launch; to run.
- Fire up a text editor.
- Fire up your computer.
4
To excite; to infuse with energy.
- The band went out to fire up the crowd before the game.
5
Dated To grow irritated or angry.
- He […] fired up, and stood vigorously on his defence.1911, Thomas Babington Macaulay, “Bunyan, John”, in 1911 Encyclopædia Britannica: