Perfectly fine, correct, or in good health and spirits.
This phrase emerged in the late 19th century, likely originating from the idea that rain is natural, necessary, and 'right' for the earth. The alliteration made it catchy and memorable, helping it spread through common usage in British English before crossing to other English-speaking countries.
The genius of this phrase lies in its positive reframing of rain, which many people consider unpleasant weather. By declaring rain as fundamentally 'right,' the expression creates an unexpectedly cheerful metaphor for perfection - it's like saying something is as good as a rainy day should be!
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