我长胖了英文怎么说

"I've gained weight" 是一种常用的表达方式。这句话的来源是英语中"gain"这个动词，意思是"增加"，"weight"意思是"体重"。

例句：

I've gained weight since I started working from home. (我开始在家工作后体重增加了)
I need to start exercising again, I've gained weight over the hopdays. (我需要再开始锻炼，我在假期里体重增加了)
I've gained weight, but I'm not going to let it get me down. (我体重增加了，但我不会让它击倒我)