shakedown

The compound "shakedown" originates from the literal action of shaking something down, such as shaking a tree to make fruit fall. This concrete image evolved in American English in the late 19th century to metaphorically describe a thorough search, as if to shake loose hidden items. By the early 20th century, it further extended to the act of extorting money, implying the victim is figuratively shaken until money "falls out." Finally, the term was applied to the rigorous testing of new systems, evoking the idea of subjecting them to stress to reveal flaws.

Structure: shake + down shake: From Old English sceacan (to shake, move to and fro). Functional role: Verbal root indicating a physical action. down: From Old English dūne (from the hill, downward). Functional role: Adverbial particle indicating direction or completion.