1.verbTo increase the speed of a motor, or to operate at a higher speed.
"He revved the engine in a rather macho style."
2.nounThe act by which an engine is revved.
3.nounA technique for reducing web page loading times by assigning far-future expiration dates to the resources on the page (so that the browser caches them indefinitely) and, if changes are needed, using different filenames for those resources.