sleep rough

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释义
睡得难受；(不住旅馆而)在公园(或车站)过夜；露宿；(无家可归者)在户外随便找个地方(如干草堆、桥下)睡觉
To sleep outdoors, without a place to go home to.

例句
Watson: What's he doing sleeping rough?
Holmes: Well, he has a very distinctive look.(Sherlock)
华生：他为什么要露宿街头？
福尔摩斯：他长相太独特了。（神探夏洛克）