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a suggestion or proposal as to the best course of action, especially one put forward by an authoritative body.

If I change as to to to, as this:

a suggestion or proposal to the best course of action, especially one put forward by an authoritative body

What is the difference in meaning?

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    Use either as to or for (or feasibly regarding) in your cited context. Plain to isn't idiomatic here. Jan 5, 2023 at 16:37
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    Note that terms like regarding, concerning (and maybe even as to) may imply a looser relationship than for (i.e. - a suggestion concerning the best course of action might not actually be something considered to be the best course of action). It might, for example, be someone proposing a mechanism for choosing between the available alternative suggestions. But that's only a possible distinction, that wouldn't normally apply (normally all prepositional elements here would be interpreted the same). Jan 5, 2023 at 16:43
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    I don't really get your "Now I can roughly know their difference". The difference between as to and to in your examples is as pointed out in my first comment. The two-word form is perfectly idiomatic, but the single word preposition to isn't (but for is). That's all there is to understand. Jan 7, 2023 at 11:54
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    NO! - It's not true that "either to or as to are acceptable in the above sentences". The single-word preposition to is not idiomatically valid here, as pointed out by the answer you yourself upvoted! Jan 7, 2023 at 14:11

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"As to" means regarding, a meaning which isn't expressed by "to" alone.

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