disillusion - definition and synonyms

verb [transitive] 

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/ˌdɪsɪˈluːʒ(ə)n/
present tense
I/you/we/theydisillusion
he/she/itdisillusions
present participledisillusioning
past tensedisillusioned
past participledisillusioned
  1. to make someone disappointed by showing them that someone or something is not as good as they had believed