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English definition of “shake something up”

shake something up

(CAUSE CHANGE) phrasal verb with shake    /ʃeɪk/ verb (past tense shook  /ʃʊk/, past participle shaken  /ˈʃeɪ·kən/)
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 (CAUSE CHANGE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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