not enough to hang a dog on
- Of evidence, not strong or compelling; with very little or insubstantial evidence.
1899, G.W. Steevens, The Tragedy of Dreyfus, page 89:If the evidence had been given at once, I should have said that it looked bad, perhaps, but was not enough to hang a dog on. But after five years of bitter faction?
1933, James Hilton, Lost Horizon, published 1973, page 62:"So there we were, and probably you'll agree with me that all the evidence, so far, was less than you'd hang a dog on."