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English definition of “work up sth”

work up sth

phrasal verb with work     /wɜːk/ US  /wɝːk/ verb
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 .Effort and expending energyTrying and making an effort
(Definition of work up sth from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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