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English definition of “shake something up”

shake something up

verb phrasal verb with shake  /ʃeɪk/ (past tense shook  /ʃʊk/, past participle shaken  /ˈʃeɪ·kən/) us  

(CAUSE CHANGE)

to cause changes to something, esp. in order to make improvements: He’s running for senator as an outsider who will shake things up.
(Definition of shake something up from the Cambridge Academic Content Dictionary © Cambridge University Press)
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