二重顎

1. Origins, structure, and basic meaning

• Structure: 二重顎 is read as にじゅうあご and is a noun for a double chin, where the contour below the chin appears layered.
• Basic usage: A model's double chin appears in モデルの二重顎, while describing it as a distinctive feature appears in 二重顎が特徴的だ.

2. Common pitfalls and similar expressions

• An aspect of appearance
  • 二重顎 does not mean that a person has two separate chins; it describes a layered-looking contour below the chin.
• Difference from 顎
  • 顎 broadly denotes the chin or jaw, while 二重顎 specifically describes the appearance of a double chin.