there's only one thing for it

there's only one thing for it

There is only a single course of action that can achieve the desired or necessary result; there is no alternative to a certain course of action. The virus wreaked so much damage that I'm afraid there's only one thing for it: we'll have to replace the entire computer infrastructure.
See also: one, thing
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

there’s only ˌone thing ˈfor it

there is only one possible course of action: Well, there’s only one thing for it, I’m afraid. You’re going to have to tell him what you’ve done and hope he forgives you.
See also: one, thing
Farlex Partner Idioms Dictionary © Farlex 2017
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