pollute verb definition in Waste and pollution topic from the Oxford Advanced Learner's Dictionary

pollute

 verb: Waste and pollution topic
to add dirty or harmful substances to land, air, water, etc. so that it is no longer pleasant or safe to use pollute something the exhaust fumes that are polluting our cities pollute something by/with something The river has been polluted with toxic waste from local factories. (figurative) a society polluted by racism