shake-up

The compound noun 'shake-up' is a relatively modern formation, derived from the phrasal verb 'to shake up'. The verb 'shake' has ancient Proto-Germanic roots (skakaną) and a Proto-Indo-European ancestor (skeg-) meaning to jump, stir, or agitate. The particle 'up' intensifies the action, implying a vigorous agitation from the bottom to the top. By the late 19th century, this literal sense of agitating a mixture was metaphorically extended to describe the radical reorganization of an institution, evoking the image of thoroughly disturbing an established order to force a new arrangement.

Structure: shake (verb) + up (particle) - shake: From Old English sceacan (to shake, move quickly to and fro). Its functional role is the core verb meaning. - up: From Old English up, upp (upward, aloft). Its functional role is an adverbial particle that intensifies and completes the verb's meaning, suggesting a thorough or disruptive action.