undo

v. deshacer, cancelar; descoser; destejer, desabrochar, zafar

s. cancelación de una acción, posibilidad en un programa de cancelar acciones realizadas últimamente

v.- deshacer | aflojar | soltar

Ex: The National Library of Estonia, established in 1918, is undergoing a revolutionary period of undoing the effects of the cultural policies of the communist regime.

(v.) = deshacer, enmendar, reparar, anular, desatar, desabrochar, desapretar
Ex: The National Library of Estonia, established in 1918, is undergoing a revolutionary period of undoing the effects of the cultural policies of the communist regime.
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* undo + the past = deshacer el pasado