reorganization, reorganisation, shake-up, shakeup -- (the imposition of a new organization; organizing differently (often involving extensive and drastic changes); "a committee was appointed to oversee the reorganization of the curriculum"; "top officials were forced out in the cabinet shakeup")
reorganization -- (an extensive alteration of the structure of a corporation or government; "after the takeover there was a thorough reorganization"; "the reorganization was prescribed by federal bankruptcy laws")