fantasear bedeutet auf Englisch

daydream [daydreamed, daydreaming, daydreams]▼(to have such a series of thoughts)
verb
[UK: ˈdeɪ.driːm] [US: ˈdeɪ.ˌdrim]Stop daydreaming. = Deja de fantasear.

fantasize [fantasized, fantasizing, fantasizes]▼(intransitive: to indulge in fantasy)
verb
[UK: ˈfæn.tə.ˌsaɪz] [US: ˈfæn.tə.ˌsaɪz]Heaven is just a dream that we fantasize about while we burn in hell. = El cielo es solo un sueño con que el fantaseamos mientras ardemos en el infierno.