disillusion
transitive-verb
UK: /ˌdɪsɪˈluːʒən/
US: /ˌdɪsɪˈluːʒən/
To make someone realize that something is not as good as they thought.
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The war disillusioned him a lot.
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She was disillusioned by the government's response to the crisis, so she left the country.
To free from illusion; to disenchant someone with a belief.
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I don't want to disillusion you.
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He became completely disillusioned with his job after discovering office fraud.