The present participle of disorder, meaning the act of creating mess or disorganization; also a noun for the process of throwing something into disarray.
From disorder (verb) + -ing (suffix creating present participles and gerunds). This is a standard word formation in English applied to the verb 'disorder.'
The -ing form is one of the most productive suffixes in English—it lets any verb become a noun instantly, which is why we can talk about 'disordering' even if we rarely do.
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