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English definition of “shake sth up”

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shake sth up

verb uk phrasal verb with shake   /ʃeɪk/ (shook, shaken) us  
C1 to cause large changes in something such as an organization, usually in order to make improvements: Technological changes have shaken up many industries. The first thing the new chairman of the company did was to shake up the management. Several new players have been brought in to shake up the team.
(Definition of shake sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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