Meaning of “disillusion” in the English Dictionary

"disillusion" in British English

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disillusionverb [ T ]

uk /ˌdɪs.ɪˈluː.ʒən/ us /ˌdɪs.ɪˈluː.ʒən/

to disappoint someone by telling them the unpleasant truth about something or someone that they had a good opinion of or respected:

I hate to/I'm sorry to disillusion you, but pregnancy is not always wonderful - I was sick every day for six months.
disillusionment
noun [ U ] uk /ˌdɪs.ɪˈluː.ʒən.mənt/ us /ˌdɪs.ɪˈluː.ʒən.mənt/ also disillusion

There is increasing disillusionment with the government.

(Definition of “disillusion” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"disillusion" in American English

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disillusionverb [ T ]

us /ˌdɪs·əˈlu·ʒən/

to disappoint someone by making the person realize the unpleasant truth about something or someone thought to be good:

He’s become disillusioned with his job and the company.
disillusioned
adjective us /ˌdɪs·əˈlu·ʒənd/

He died a disillusioned man.
disillusionment
noun [ U ] us /ˌdɪs·əˈlu·ʒən·mənt/

(Definition of “disillusion” from the Cambridge Academic Content Dictionary © Cambridge University Press)