not have a leg to stand on idiom
没有依据，无法证明
to be in a situation in which you cannot prove something
If you have no witnesses, you don't have a leg to stand on. 如果没有证人，你就无法证明。
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。