1. upset or frighten someone, a notable change or reorganization of something, extort or blackmail someone, thoroughly search someone/something
shake things up/shake someone down
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.