that cat won't jump

that cat won't jump

There's no way that idea will work; that suggestion is unrealistic or completely unfeasible. I hear many saying that we ought to do away with taxes altogether, but I'm afraid that cat won't jump.
See also: cat, jump, that

that cat won't jump

that suggestion is implausible or impracticable. informal
1965 Simon Troy No More a-Roving If you're telling me she fell in, just like that—oh no! That cat won't jump.
See also: cat, jump, that