skeleton in the cupboard字面意思橱里的骨架，引申为“不可外扬的家丑，隐情”。

【例句】
She never refers to her childhood; I wonder if she has a skeleton in the cupboard?
她从来不谈及其童年，我怀疑她是否有隐秘的家庭丑事。

Every family is said to have at least one skeleton in the cupboard.
据说家家户户多多少少都有自家丑事。