Stir something, spread it, break down a mechanism. The proposed etymologies are various, that it comes from loosen (remove the setting to something), of desbarajar (mixing, stirring about the cards), thwart (ruining a business), or a combination of these verbs. But may not be more than alleged interference over the old verb desvarahustar, with the prefix des_ ("scatter") varahuste ("Lancer"), which named the flight in in all directions of the soldiers.
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