In the phrase "it stands to reason that...", is reason a verb or a noun?
If it is a verb, it is subordinate to the verb stands, which is being used metaphorically:
it is sound/stable for one to reason that...
On the other hand, used as a noun, I imagine that reason is a synecdoche for the principles of logic and rationality, or something like that, and that to stand to reason is to withstand any logical rebuke from this capital-R Reason.
I feel these mean two slightly different things, and in either case, they correspond to different parse trees, so which is more accurate to the original/proper usage?