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3. have a leg to stand on

have a leg to stand on

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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!

See also: have, leg, on, stand