leave no trace

Definitions

1. To follow certain outdoor ethical guidelines while camping, etc., so thoroughly that it would appear as though one had never previously been there, for the sake of nature conservation.
2. Used other than figuratively or idiomatically: see leave, no, trace.

Examples

“Camping in a pristine area is the ultimate Leave⟳ No Trace challenge⟳ because it is imperative that you literally leave⟳ no trace—and that is very hard to do.”

“These fences catch⟳ any MOOP (“matter⟳ out of place⟳”) that blows out of peoples' camps, where it can be harvested and packed out—leave⟳ no trace—and all that.”

“"Although people don't think⟳ it, the traveller ethos at free festivals was "leave⟳ no trace"—you went there, you had a party you cleaned up.”

CEFR level