sleep rough 露宿；风餐露宿

【例句】
Those who do not have relatives to return to are left to wander the streets and sleep rough.
举目无亲的人只好四处游荡，露宿街头。

It is hard to imagine what it is like to sleep rough at any time, but doubly so in the current freezing weather.
无论何时，露宿街头的滋味都是难以想象的，更何况是在现在这么冷的天气下。