to surprise sb and make them think about sth in a different way, become more active, etc.; to make important changes in an organization, a profession, etc. in order to make it more efficient
shake sb up
to surprise sb and make them think about sth in a different way, become more active, etc.
shake sth up
to make important changes in an organization, a profession, etc. in order to make it more efficient
Definitions from the Oxford Advanced Learner's Dictionary, 9th edition