n.
      - rubbish left in public. 
▸a collection of things lying about untidily.
 - a number of young born to an animal at one time.
 - 
(also cat litter)
 granular absorbent material lining a tray for a cat to urinate and defecate in indoors.
 - straw or other plant matter used as animal bedding.
 - 
(also leaf litter)
 decomposing leaves and other matter forming a layer on top of soil.
 - historical a vehicle containing a bed or seat enclosed by curtains and carried by men or animals. 
▸a framework with a couch for transporting the sick.
 
v.
  - make untidy with litter. 
▸leave (rubbish or objects) lying about untidily.
 - archaic provide (an animal) with litter as bedding.
 
 
  Etymology
  ME (in sense 6): from OFr. litiere, from med. L. lectaria, from L. lectus ‘bed’.