get a leg to stand on

to have no support for what one thinks, says, or does
نداشتن هیچ مدرک و پشتوانه ای درباره آنچه یک فرد فکر می کند، می گوید یا عمل می کند
مثال؛
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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