A chin is the front part of your face below your nose and above your neck.
When you talk or eat, you stick out your chin sometimes, and when you think deeply, you might push it forward a bit too. People often refer to someone's chin when they say "stick out your chin" meaning don't be afraid to take risks or show confidence. A strong or stubborn person is said to have a "set jaw and chin", like they're not going to back down from anything. You might also hear about having a cleft chin, which means there's a little extra skin on the bottom of your chin that forms a V shape.
How common is "chin"?
Word chin is considered uncommon in modern English. It appears most frequently in fiction texts and less often in other writings.
Definitions
noun
The bottom of a face, (specifically) the typically jutting jawline below the mouth.
Talk.
A lie, a falsehood.
The ability to withstand being punched in the chin without being knocked out.
The lower part of the front of an aircraft, below the nose.
The bottom part of a mobile phone, below the screen.
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mentumglass jaw
verb
To talk.
To talk to or with (someone).
To perform a chin-up (exercise in which one lifts one's own weight while hanging from a bar).
To punch or hit (someone)'s chin (part of the body).
To put or hold (a musical instrument) up to one's chin.
To turn on or operate (a device) using one's chin; to select (a particular setting) using one's chin.
To put one's chin on (something).
To indicate or point toward (someone or something) with one's chin.