English version

not have a leg to stand on

From Longman Dictionary of Contemporary Englishnot have a leg to stand onnot have a leg to stand oninformalPROVE to be in a situation where you cannot prove or legally support what you say If you didn’t sign a contract, you won’t have a leg to stand on. leg
Examples from the Corpus
not have a leg to stand onIf you didn't sign a contract, you won't have a leg to stand on.
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