Rainbows and unicorns: A linguistic history

It all seems to date back to a 19th-century French book

RBU's 4ever.
(Image credit: Facebook/Lisa Frank)

It's not all rainbows and butterflies, you know. Or rainbows and unicorns. Or butterflies and unicorns. But when it comes to referring to impossibly perfect conditions where everyone's happy and nothing goes wrong, we're living in a golden age of RBUs.

A Google News search for just the past week brings up almost 500 hits for rainbows and unicorns or rainbows and butterflies. On this Google Ngram Viewer graph below, you can see that both expressions, as well as butterflies and rainbows, are on the rise, with rainbows and unicorns in particular shooting steadily up since 2003.

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Neal Whitman is a columnist for the online resource Visual Thesaurus, and an occasional guest writer for the podcast "Grammar Girl's Quick and Dirty Tips for Better Writing." He teaches ESL composition at The Ohio State University, and blogs at Literal-Minded, where he writes about linguistics from the point of view of a husband and father.