I. com ‧ post 1 /ˈkɒmpɒst $ ˈkɑːmpoʊst/ BrE AmE noun [uncountable]
[ Date: 1300-1400 ; Language: Old French ; Origin: 'mixture, combination' , from Medieval Latin compositum , from Latin compositus ; ⇨ ↑ composite 1 ]
a mixture of decayed plants, leaves etc used to improve the quality of soil
II. compost 2 BrE AmE verb [transitive]
to make plants, leaves etc into compost