IPA: /ˈʃeɪkˌdaʊn/
KK: /ˈʃeɪkˌdaʊn/
A type of test or trial that is done to check how well something works, especially a ship or aircraft, and to help the crew learn how to operate it.
The crew went on a shakedown cruise to ensure the ship was ready for its first voyage.
A thorough search of a person or place, often to find something hidden, or the act of extorting money from someone, usually through threats or coercion.
The police conducted a shakedown of the suspect's apartment looking for evidence.
Shakedown is formed from "shake" (from Old English "sceacan", meaning to move or disturb) and "down" (meaning from a higher to a lower position). The word describes the act of shaking something down, often to extract information or money.
Think of 'shaking' something to 'disturb' it and 'down' means to bring it lower — that's why a shakedown refers to extracting something by shaking it down.