Fantasize (verb)

1. Form a mental image of something that is not real or present.
2. Indulge in daydreams or imaginative ideas about something desired or unlikely.

Origin:

From the english word "fantasy" meaning imagination, illusion.

Examples:

1. I often fantasize about winning the lottery.
2. He fantasized about traveling around the world.
3. She fantasized about a life of luxury.
4. He fantasized about being a famous actor.
5. She fantasized about being a famous singer.