Definition of Disillusion

Noun: disillusion  ,dis-u'loo-zhun

  1. Disappointment on finding out that something is not as good as hoped, or that previous beliefs were false
    - disenchantment, disillusionment
Verb: disillusion  ,dis-u'loo-zhun
  1. Cause someone to understand that something they previously believed is false or overly optimistic
    - disenchant

See also:
dishy
disillusioned