“一竿子打翻一船人”，中文俗语，意思是因为对某人或某物不满意，就否定和他们类似的人或物。与英文俗语“tar somebody/something with the same brush”意思相近，表示“to unfairly categorize someone or something as being the same as another person or thing, usually in a negative manner”。

例句：

仅仅因为首席执行官是一个腐败的无赖，并不意味着我们应该一竿子打翻一船人，抹黑整个公司。

Just because the CEO turned out to be a rotten scoundrel doesn't mean we should tar the entire company with the same brush.

我哥们儿觉得我不应该和琼约会，因为她离过婚。他交往过离婚女人，觉得她们的人生态度都很消极。不过，我不会一竿子打翻一船人，这不公平。

My buddy thinks that I shouldn't ask Joan out because she's divorced and he'd dated divorcees who seemed desperate. But I'm not going to tar her with the same brush. It isn't fair.