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English definition of “work up sth”

work up sth

verb uk phrasal verb with work   /wɜːk/ us    /wɝːk/
to develop an emotional or physical state that you feel strongly, after a period of effort or time: We worked up a real appetite climbing in the mountains. It's strange, but I can't work up any enthusiasm for going on this trip.
(Definition of work up sth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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