fire up

present singular third person fires up · participle present firing up · participle past fired up · past fired up

1. transitiveTo ignite.

   Let's fire up the grill and have a barbecue.

   1 more example

   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

   Synonyms: inflame, kindle, aflame, alight, conflagrate, fire, ignite, inflame

2. intransitiveOf an engine or similar, to start.

   The generator fired up shortly after the power failure began.

   Synonyms: fire, start up

3. informaltransitivecomputingTo launch; to run.

   Fire up a text editor.

   1 more example

   Fire up your computer.

   Synonyms: activate, start up

4. transitiveTo excite; to infuse with energy.

   The band went out to fire up the crowd before the game.

   Synonyms: ginger up, spice up, animate, arouse, awaken, beghast, leaven, bright

5. datedintransitiveTo grow irritated or angry.

   He […] fired up, and stood vigorously on his defence.

   1911, Thomas Babington Macaulay, “Bunyan, John”, in 1911 Encyclopædia Britannica

   Synonyms: anger