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English definition of “shake sth up”

shake sth up

phrasal verb with shake     /ʃeɪk/ verb [T]
to make important changes to a system or organization: They saw the potential of the Internet to shake up the whole retail sector and change the way it works. They appointed a new CEO to shake up the organization. The new head of HR has already started to shake things up.
(Definition of shake sth up from the Cambridge Business English Dictionary © Cambridge University Press)
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