Present participle: the act of making something messy or disorganized by disturbing its arrangement.
From dis- + arrange + -ing (present participle suffix). Standard English verb form formation showing ongoing action.
The -ing form is one of English's most versatile suffixes—it can be a verb form, a noun, or an adjective, and 'disarranging' shows how the same word can describe an action happening right now.
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