Definition of "shake up"

shake up

verb
third-person singular simple present shakes up, present participle shaking up, simple past shook up, past participle shaken up
1. (transitive) To agitate by shaking.
2. (transitive) To restore to its original shape by shaking.
3. (transitive, informal) To upset or distress (a person).
4. (transitive, informal) To reorganize, to make reforms in.