chin

The chin is the part of the face that is below the mouth and above the neck. A fully developed human skull has a chin of between 0.7 cm and 1.1 cm. The presence of a well-developed chin is considered to be one of the morphological characteristics of Homo sapiens [智人] that differentiates them from other human ancestors such as the closely related Neanderthals [尼安德特人].

While some more obese people may appear to have a "double chin", this is only a facial feature of the neck where multiple layers of skin build up. There are two possible causes for a double chin, which have to be differentiated. In overweight people, commonly the layer of subcutaneous fat around the neck sags down and creates a wrinkle, creating the appearance of a second chin. Another cause can be a bony deficiency, commonly seen in people of normal weight.

The terms cleft chin, chin cleft, dimple chin, or chin dimple refer to a dimple on the chin. It is a Y-shaped fissure [deep crack] on the chin with an underlying bony peculiarity. A cleft chin is an inherited trait in humans and can be influenced by many factors. In some culture, the chin dimple is considered a factor of beauty, and is metaphorically referred to as "the chin pit" or "the chin well": a well [井] in which the poor lover is fallen and trapped.

据说猫和狗都喜欢被摸下巴。都是哺bǔ乳动物，词典里有："chuck somebody under the chin" - to gently touch someone under their chin in a friendly way.

还有：chin-wag =chat. 中文则有“嚼舌根”的说法。

wag

1. When a dog wags its tail, it repeatedly waves its tail from side to side.
2. If you wag your finger, you shake it repeatedly and quickly from side to side, usually because you are annoyed with someone.
3. If you wag your head, you move it from side to side, often because you are unhappy about a situation. =shake

"(keep your) chin up!" is used to tell someone to make an effort to stay brave and confident when they are in a difficult situation.

"take something on the chin" means to accept a difficult or unpleasant situation without complaining.

和chin搭配的部分形容词有：determined, resolute, square [方的], firm; pointed/pointy [尖的] weak

chinless: having a small chin, regarded as a sign of a weak character 小下巴的(被视为性格懦弱的标志)

六级/考研单词: skull, obese, multiple, differentiate, ancestor, underlie, peculiar, trait, metaphor, pit, trap, wrinkle, norm, fingerprint, seldom, situate, timid, tentative