不可告人的秘密；不可外揚的家醜或醜事。
例句：
- If you want to be a successful politician, you can't afford to have too many skeletons in your cupboard. (如果你想成為成功的政治人物，你就不能有太多不可告人的秘密)
- I learned last night that Mr. Smith's youngest son has been three times sent to prison. I wonder how many other skeletons he's got in his closet. (昨晚我聽說史密斯先生最小的兒子曾三度入獄。我不知道他家還有哪些不可外揚的醜事)
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