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Wiktionary
skeleton in the cupboard

n. A shameful secret.

WordNet
skeleton in the cupboard

n. a scandal that is kept secret; "there must be a skeleton somewhere in that family's closet" [syn: skeleton, skeleton in the closet]

Usage examples of "skeleton in the cupboard".

But this sort of genius -- For a financial family a painter is rather a skeleton in the cupboard.

Why yes, there must be some skeleton in the cupboard or you wouldn't run him down.