without a leg to stand on
With no chance of success, as in He tried to get the town to change the street lights, but because there was no money in the budget he found himself without a leg to stand on. A related idiom is not have a leg to stand on, as in Once the detective exposed his false alibi, he didn't have a leg to stand on. This metaphoric idiom transfers lack of physical support to arguments or theories. [Late 1500s]
Words nearby without a leg to stand on
within-named,
within-subjects design,
withindoors,
withlacoochee,
without,
without a leg to stand on,
without a stitch on,
without batting an eye,
without doubt,
without fail,
without further ado