“上大号”用英语怎么说

 Take a dump 上大号

A: Would you mind closing the door? I‘m trying to take a dump here.
你可不可以把门关起来啊？我正在上大号。

B: Well, learn to lock the door next time.
那么下次学会把门锁起来吧！

“Dump”是”丢掉”的意思，”丢”什么就不必解释了吧？”我要上厕所”(大小号都一样) 可以说 “I need to use the restroom.” 或简单地说”I need to go.”