home truth
noun/ˌhəʊm ˈtruːθ/
/ˌhəʊm ˈtruːθ/
[usually plural]- a true but unpleasant fact about a person, usually told to them by somebody else
- It's time you told him a few home truths.
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home truth
Definition of home truth noun from the Oxford Advanced Learner's Dictionary