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Definition of work up phrasal verb from the Oxford Advanced American Dictionary

 

work up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

work somethingup

 
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to develop or improve something with some effort I can't work up any enthusiasm for his idea. She went for a long walk to work up an appetite.

work somebody/yourself up (into something)

 
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to make someone/yourself reach a state of great excitement, anger, etc. Don't work yourself up into a state about it. It isn't worth it. What are you so worked up about?
See work up in the Oxford Advanced Learner's Dictionary