see a man about a dog
离开一会儿，通常是为了完成或处理某件事情
口语·幽默或委婉地离开
英文释义
to excuse oneself to attend to a personal matter, often used as a euphemism for going to the bathroom
例句
I have to see a man about a dog, I'll be right back.
典故来源
19世纪英国俚语，原指处理私事，后演变为上厕所的委婉说法。