Learn English – the origin of “right as rain”

etymologyidioms

I looked this up, and came up with:.

It makes no more sense than the variants it has usurped and is clearly just a play on words (though perhaps there’s a lurking idea that rain often comes straight down, in a right line, to use the old sense).

The author here doesn't seem to know very clearly what its origin is. He is speculating it's just a play on words.

Does anyone have any definitive answer or evidence?

Best Answer

Your source World Wide Words makes the point that the phrase right as... has appeared in many forms over the years and that right as rain probably became the favoured variant because of its pleasing alliteration. It seems like a reasonable conclusion and all I can do here is add further support to his theory from an earlier example.

This is from In the Midst of Alarms by Robert Barr, 1894:

"To whom are you engaged? As I understand your talk, it is to Miss Bartlett. Am I right?"

"Right as rain, Renny."

Perhaps it was a phrase that was already in common usage at this point but the triple alliteration here is striking.