Increasing the speed of an engine rapidly, making it produce louder sounds.
From 'rev,' short for 'revolution' (referring to engine revolutions per minute), which became common in the early 20th century with automobiles; 'revving' is the present participle form.
The word 'revving' is so new in human history—invented less than 150 years ago—yet it immediately captures that visceral excitement of power, showing how quickly new words can become emotionally loaded in our brains!
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