Etymology
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shake-up (n.)

also shakeup, 1847, "a shaking or stirring up;" 1899, "reorganization;" from the verbal phrase; see shake (v.) + up (adv.). Also in colloquial use, "a commotion, disturbance" (1880s). The verbal phrase shake up is attested from 1753 as "to shake together for the purposes of combining;" by 1833 as "to loosen and restore (a pillow, etc.) to proper condition by shaking;" and by 1884 as "upset the nerves, agitate" on the notion of "jar thoroughly in such a way as to damage or impair."

updated on July 26, 2022

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Definitions of shake-up from WordNet

shake-up (n.)
the imposition of a new organization; organizing differently (often involving extensive and drastic changes);
Synonyms: reorganization / reorganisation / shakeup
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.