IPA: /ˈʃeɪkʌp/
KK: /ˈʃeɪkˌʌp/
A significant change or reorganization, especially in a company or organization, often involving personnel adjustments.
The company announced a shakeup in management to improve efficiency.
Shakeup → It is formed from "shake" (from Old English "sceacan", meaning to move or disturb) and "up" (meaning to a higher position or level). The word "shakeup" refers to a significant change or disturbance that alters the current state of affairs, often in a dramatic way.
Think of something being 'moved or disturbed' ('shake') and then 'raised' or 'elevated' ('up') — that's why a shakeup means a significant change.