Enough has been said or done about. Used to point out that you have finished with one thing or are going to take up something else. So much for the geography of Ireland, we will now talk about the people who live there. "I have nothing more to say to you, Tommy, and so much for that," Mary said angrily.
SO MUCH FOR
Meaning of SO MUCH FOR in English
American idioms English vocabulary. Английский словарь американских идиом. 2012