To separate, divide, or break apart things that were joined or united.
From dis- (apart) + sunder (from Old English 'sundrian' meaning to separate). This archaic verb emphasizes forceful or complete separation, with roots going back to Germanic languages.
Although rare today, 'dissunder' shows how redundant prefixes were sometimes added in older English—'dis-' and 'sunder' both mean separation, so the word is like saying 'un-undo' in modern English.
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