decluttering

前缀

词干

后缀

de-: reversal, undoing · to remove from, removed
-ing: Used to form nouns or noun-like words (or elements of noun phrases) from verbs, denoting the act of doing something, an action, or the embodiment of an action. · Used to form nouns denoting materials or systems of objects which are used or employed in an action, or considered collectively.

From de- +‎ clutter +‎ -ing. Compare declutter (attested later).

1The act or process of removing clutter; tidying, removing unwanted or messy items from a given place. [from 20th c.]