fantasize

/ˈfæntəˌsaɪz/

Etymology

From fantasy + -ize.

verb

To indulge in fantasy; to imagine things only possible in fantasy.“I fantasized about my ideal date.”
To portray in the mind, using fantasy.“Not that Mom and I didn't have our "shared experiences" — it's just that I'd like to forget most of them. I'd rather fantasize us together in that little cafe.”