be curtains

be curtains for (someone or something)

To be the end, death, or demise of someone or something. Oh, it'll be curtains for the informant once I find him! Unfortunately, if this merger doesn't go through, it's curtains for our company.
See also: curtain

be ˈcurtains (for somebody/something)

(informal) cause the death of somebody or the end of something: It’ll be curtains for the business if the bank doesn’t give us that loan.
See also: curtain