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Verb: fantasise  'fan-tu,sIz
Usage: Brit (N. Amer: fantasize)
  1. Indulge in fantasies
    "he is fantasising when he says he plans to start his own company";
    - fantasy, fantasize
  2. Portray in the mind
    "he is fantasising the ideal wife";
    - fantasize

Derived forms: fantasises, fantasised, fantasising

Type of: conceive of, envisage, ideate, imagine