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- have a leg to stand on
have a leg to stand on
not have a leg to stand on
to be in a situation where you cannot prove something The problem is, if you don't have a witness, you don't have a leg to stand on. I haven't even got the receipt to prove where I bought it, so I don't have a leg to stand on.
See Break a leg!, pull leg, Shake a leg!, Show a leg!