Jump to conclusions

jump to conclusions 过早下结论，贸然断定

jump 跳

conclusion 结论

Let’s not jump to conclusions.咱们先别这么快就下结论。

I know you saw her with a man, but don't jump to conclusions, talk to her first. 我知道你看到她和一个男人在一起，但不要妄下结论，你先跟她谈一下。