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bang goes (something)!
A phrase said about a lost opportunity. That whole wing of the mall is under construction, so bang goes our shopping trip!
bang goes somethingmainly BRITISH, INFORMAL
If you say bang goes something, you mean that it is now obvious that you will not be able to do or achieve something. This means I'm going to have to work till midnight. Bang goes my early night! Bang goes his influence, maybe his job, if the two countries can't reach an agreement.
bang goes —used to express the sudden or complete destruction of something, especially a plan or ambition.
1895 George Bernard Shaw Letter Somebody will give a surreptitious performance of it: and then bang goes my copyright.