Definitions
1.NounA confused disordered jumble of things.
2.NounBackground echoes, from clouds etc., on a radar or sonar screen.
3.NounAlternative form of clowder (“collective noun for cats”).
4.NounClatter; confused noise.
5.NounA Sperner family.
6.VerbTo fill something with clutter.
7.VerbTo clot or coagulate, like blood.
8.VerbTo make a confused noise; to bustle.
9.VerbTo utter words hurriedly, especially (but not exclusively) as a speech disorder (compare cluttering).