FANTASIZE

fantasize, fantasise

(verb) portray in the mind; “he is fantasizing the ideal wife”

fantasy, fantasize, fantasise

(verb) indulge in fantasies; “he is fantasizing when he says he plans to start his own company”

Source: WordNet® 3.1

Etymology

Verb

fantasize (third-person singular simple present fantasizes, present participle fantasizing, simple past and past participle fantasized)

(intransitive) To indulge in fantasy; to imagine things only possible in fantasy.

(transitive) To portray in the mind, using fantasy.

Source: Wiktionary