I. adverb
Etymology: Middle English so muche (adverb phrase), from so (I) + muche, adverb, much
: by the amount indicated or suggested
if they lose their way, so much the better for us
II. adjective
Etymology: Middle English so muche (adjective phrase) such a quantity of, from so (I) + muche, adjective, much
1. : of an equal amount — often used as an intensive
the house burned like so much paper
2. : of an unspecified amount — often used as an intensive
the common notion of a classic or romantic literature is so much nonsense — Irving Kolodin
III. pronoun
Etymology: Middle English so muche, from so muche (adjective phrase)
1. : something (as an amount or price) unspecified or undetermined
charge so much a mile
2. : that is all that can be or is to be said or done now
so much for the history of the case