Usage Note
Fantasmer is used intransitively (je fantasme) or with sur (fantasmer sur quelque chose — to fantasise about something). It ranges from innocent daydreaming to explicitly sexual fantasy depending on context; be aware of register. The noun le fantasme (fantasy, especially an erotic one) is more commonly encountered than the verb in written French.
Examples
"Il fantasme souvent sur des voyages lointains."
Natural Translation
He often daydreams about faraway travels.
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