A confused disordered jumble of things.
Background echoes, from clouds etc., on a radar or sonar screen.
To utter words hurriedly, especially (but not exclusively) as a speech disorder (compare cluttering).
To fill something with clutter.
To make a confused noise; to bustle.
The grid of such a puzzle
A word puzzle in which interlocking words are entered usually horizontally and vertically into a grid based on clues given for each word.