Wiktionary
camp out
vb. (context intransitive English) To sleep outdoors, often in a tent.
WordNet
Usage examples of "camp out".
And His Majesty would assuredly be most wroth were his greatly esteemed Lord Commander of the Royal Horse obliged to camp out in some muddy field, yes, or bide in a stable.
If they have a breakdown, they can always camp out for the night because the weather in March is still good, nice and cool in the evenings with autumn coming on.