: things that have been thrown away and that are lying on the ground in a public place
: a messy pile or group of things
: dry material that is spread in a container and used as a toilet by animals (especially cats) while they are indoors
: to cover (a surface) with many things in an untidy way
: to throw or leave trash on the ground in a public place
What made you want to look up litter? Please tell us where you read or heard it (including the quote, if possible).