"Greased lightning" is an old expression for something that moves very fast, since lightning is very fast, and something that is greased moves along in a fast slippery way. Also from "greased" plus "lightning", believed to come from the observation that greased machinery tends to run faster, and the notion that if a lightning strike (the fastest normally observed movement) could be greased, it might move even faster. The phrase originated in the U.S. and then moved around the world, and is now primarily associated with "Grease" due to the popularity of the movie. The Grease in the "Greased Lightning" title also reminds the audience of the Greasers on whom this movie is focused. Noun; greased lightning (uncountable). Something incredibly fast (now mainly used in comparison: like or faster than greased lightning).

Film

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