- have not a leg to stand on; be done for; be untenable; cannot be justified; cannot hold one's ground; cannot hold water; (What you said) doesn't hold water.; groundless; ill-founded; ill-grounded; impossible to defend; unable to consolidate one's position; unable to get a footing; unable to stand [maintain] one's ground:
He hasn't a leg to stand for this theory of his.
他的这种理论是站不住脚的。
Your argument is ill-founded.
你的理由站不住脚。