I. ˈklə-tər verb
Etymology: Middle English clotteren to clot, from clot
Date: 1556
intransitive verb
chiefly dialect : to run in disorder
transitive verb
: to fill or cover with scattered or disordered things that impede movement or reduce effectiveness
a room clutter ed with toys
— often used with up
II. noun
Date: 1649
1.
a. : a crowded or confused mass or collection
b. : things that clutter a place
2. : interfering radar echoes caused by reflection from objects (as on the ground) other than the target
3. chiefly dialect : disturbance , hubbub