To 'shake up' is a phrasal verb with two meanings. If someone is 'shaken up' they are physically or emotionally disturbed by something. To 'shake up' something can also mean to undergo an extreme rearrangement or change. To 'shake down' is a colloquial, informal phrasal verb meaning to get money from someone, usually using extortion or questionably legal means. To 'shake down' a place can mean to search it thoroughly. A test of a new product, model or design is also known as a 'shakedown' as well as a temporary or improvised bed.

1. After the accident, Julie was very shaken up and needed the support of her friends.
2. The airport security guard shook me down to make sure I wasn't trying to bring anything illegal onto the plane.

1. Under the ambitious new owner, the company is undergoing a radical shake-up.
2. Our daily staff meetings were becoming boring, so I decided to shake things up a little by moving them outside.
3. The company was accused of using bribes and shakedowns to secure a lucrative deal in the developing country.