Litter/ˈlɪtər/ Definition 1 of 4Pro Tip 1/3Environmental Impact Refers to the negative effect of leaving trash in public spaces, harming ecosystems. Littering by the river affects the water quality and wildlife. Pro Tip 2/3Social Responsibility Implies a collective duty to keep our surroundings clean by not littering. Everyone at the event was reminded of their responsibility not to litter. Pro Tip 3/3Civic Offense Littering often violates local laws and may result in fines or community service. He was fined for littering on the sidewalk.