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English definition of “wise up”

wise up

mainly US informal
verb uk phrasal verb with wise   /waɪz/ us  
to start to understand a situation or fact and believe what you hear about it, even if it is difficult or unpleasant: Those who think this is a harmless recreational drug should wise up. It's about time employers wised up to the fact that staff who are happy work more efficiently.
(Definition of wise up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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