the world > physical sensation > cleanness and dirtiness > dirtiness > pollution or defilement > environmental pollution > pollute the environment [verb (transitive)] > cover with litter (2)
transitive. To strew with rubbish or things in disorder; to make untidy with litter. Also figurative.
transitive. Australian, New Zealand, and English regional. To make (a thing) dirty; to block or litter (a place), esp. with mining refuse. Usually…