1 general:: Phrase(s): so much for someone or something that is the last of someone or something; there is no need to consider someone or something anymore. • It just started raining. So much for our picnic this afternoon. • So much for John. He just called in sick and can’t come to work today.
McGrawhill's American Idioms And Phrasal Verbs
2 general:: We have sufficiently treated or are finished with something, as in So much for this year's sales figures; now let's estimate next year's. [Late 1500s]
American Heritage Idioms