expression, godan verb (-ru)
pitch camp; set up camp
Used for setting up a tent or establishing a campsite. The verb 張る here means to stretch or set up, as in pitching a tent.
湖畔にキャンプを張った。
We pitched camp by the lake.
今夜はここにキャンプを張ろう。
Let's set up camp here tonight.
More specific: 'to pitch a tent'. キャンプを張る refers to the whole campsite, not just the tent.
Phrase combining the loanword キャンプ (camp) with the verb 張る (to stretch, set up).