If someone fantasizes, they try to excite themselves sexually by imagining a particular person or situation. Research has shown that men are likely to fantasize far more frequently than women I tried to fantasize about Christine: those wondering blue eyes, that coppery red hair of hers. to imagine that you are doing something which is very pleasant or exciting, but which is very unlikely to happen fantasize about
fan·ta·size fantasizes fantasizing fantasized in BRIT, also use fantasise1. If you fantasize about an event or situation that you would like to happen, you give yourself pleasure by imagining that it is happening, although it is untrue or unlikely to happen. I fantasised about writing music Her husband died in 1967, although she fantasised that he was still alive