curtains for, be.

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

curtains for, be.

Also, it's curtains. Be the end, especially death. For example, If he hadn't worn a bullet-proof vest, it would have been curtains for him, or It's curtains if she doesn't finish on time. This expression is a metaphor for the falling curtain signifying the end of a performance. [Slang; c. 1900]
See also: curtain