What does the idiom have a leg to stand on mean?

The idiom "have a leg to stand on" means to have a valid reason or justification for something. It implies that you have strong evidence or a sound argument to support your claim or position.

Here's how it works:

* Imagine a table with only one leg. It wouldn't be stable and would collapse.

* Similarly, if your argument or claim lacks strong evidence, it's like a table with one leg – it can't stand up on its own.

Examples:

* "The company's lawsuit against the employee has no legs to stand on because they can't prove he was responsible for the data breach."

* "The politician's accusations are baseless and don't have a leg to stand on."

* "I can't accuse him of stealing without evidence, so my claim doesn't have a leg to stand on."

In short, "have a leg to stand on" means to have a solid foundation or justification for your argument or claim.