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- set on fire
set on fire
set someone on fire
Fig. to excite someone; to make someone passionate. (Based on set fire to someone or something.) Her oratory set everyone on fire. Ted's presentation didn't exactly set me on fire, but it was a good summary of the project.
set on fire
1. Also, set fire to. Cause to ignite and burn, as in The drought and high wind combined to set the woods on fire. [c. 1400]
set on fire
1. To cause to ignite and burn.
2. To cause to become excited: The music set the audience on fire.