The idiom "thin on top" is derived from the observation that individuals who experience hair loss or a receding hairline tend to have less hair specifically on the top of their heads. It is typically used to describe someone who has a noticeable reduction in hair density on the crown or upper portion of their head. This phrase is often used in a descriptive or observational manner and is commonly associated with aging or male pattern baldness.

英語での「thin on top」の定義と意味

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