Without written evidence, we don't have a leg to stand on.

我们没有书面证据就站不住脚。

《牛津词典》

Any lawyer will tell you, if you're cohabiting and the man leaves you, you haven't got a leg to stand on.

所有的律师都会告诉你说，如果和你同居的男人离开了你，你没有权利要求经济补偿。

《柯林斯英汉双解大词典》

Oh, in that case, he doesn't have a leg to stand on!

哦，在那种情况下，司机说的话就站不住脚了。

youdao

Given the Palestinians' overwhelming, consistent and violent support for the destruction of Israel in any size, this leftist fantasy never had a leg to stand on.

CENTERFORSECURITYPOLICY: Israel's Only Two Options

"What I was saying was, let's have better informed dialogue about Sellafield but leave the emotive stuff out of it, particularly that claim, which doesn't have a leg to stand on, " he said.

BBC: Sellafield comment 'offensive'

So when it comes to estimating economic impact for sporting events, best to show caution and restraint, and ultimately attempt to verify any public statements with market research vis-a-vis on-site data collection so that you have a leg to stand on when reporting such figures.

FORBES: Educating Sports Commissions and CVBs About the Economic Impact of Sports