To take apart or break down something that was organized, causing it to lose its structure or order.
From de- (to reverse) + organize (from Greek organon, meaning 'tool' or 'instrument'). The verb form follows standard English patterns of adding de- to reverse the meaning of an action.
While 'disorganize' is more common, 'deorganize' specifically implies actively dismantling something that was carefully put together—there's something almost violent about it, like taking apart a machine piece by piece.
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