so much for (something)
idiomPart ofmuch
so much for (something) — idiom
1. used to express disappointment that something did not happen as planned, or that
1.idiom
Definition
used to express disappointment that something did not happen as planned, or that something was not as good or useful as expected
Example
The train left without us — so much for arriving early to get good seats.
It started raining as soon as we set up the picnic — so much for our outdoor lunch.