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fantasize

verb [I or T] (UK usually fantasise)
 
 
/ˈfæn.tə.saɪz/

Definition

to think about something very pleasant that is unlikely to happen: He fantasized about winning the Nobel Prize. [+ that] As a child, Emma fantasized that she would do something heroic.Dreaming
(Definition of fantasize verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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