Right as Rain
Meaning
Completely correct, proper, sound and healthy.
Example
On the witness stand she appeared to be right as rain, but then she is an actress by profession.
Origin
This one is likely alliterative. The R’s in Right and Rain sound good together. This comes from the idea of rainwater being pure and wholesome (before the days of pollution and acid rain). The reference is to the value and goodness of rain which is critical to crops and farming.
