not have a leg to stand on
To have no case at all
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Main Entry: ↑leg
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to not have any way of proving that you are right about something
When it comes to centralism, the UK government doesn’t have a leg to stand on.
Thesaurus: to be in, or to get into a difficult situationsynonym
Main entry: leg
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have no facts or sound reasons to support one's argument or justify one's actions
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not have a leg to stand on
: to have no support for what you think, say, or do
He claims that the company cheated him, but without evidence of a written agreement, he doesn't have a leg to stand on.
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Main Entry: ↑leg
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Main Entry: ↑stand
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not have a ˌleg to ˈstand on idiom
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Without written evidence, we don't have a leg to stand on.
Useful english dictionary. 2012.