bum out的意思是"感到沮丧，失望，泄气"。
以下是bum out的英文范文：
I was really bummed out when I missed the important meeting. I had been looking forward to it all week and now I'm feeling really down.
bum out的意思是“感到沮丧；泄气”，英文范文相关如下：
1. He couldn't bear to bumb out after failing the exam.（他考试没考好，他无法忍受感到沮丧。）
2. She bumbed out when she saw the news.（她看到新闻后感到沮丧。）
3. We tried our best, but we still bumbed out in the end.（我们尽力了，但最终还是感到沮丧。）
以上内容仅供参考，建议在具体语境下理解该词的含义。
bum out的意思是“使沮丧；使灰心”。
在英文范文中的用法示例如下：
With the exam results out, I could tell from the look on their faces that they were all bummed out. 考试成绩公布后，从他们的表情上我可以看出他们都很沮丧。
以上仅为一个示例，实际使用时需要根据语境来判断其具体含义。