noun / verb
chin
CHIN/tʃɪn/
The part of the face projecting below the mouth.
The man's chin protrudes below his closed mouth.

Etymology
Old English cin already meant “chin,” but cinbane meant “jawbone.” This shows the historical overlap between names for the chin and the larger jaw area.
In context
The chin also sticks out slightly, creating a subtle indentation between itself and the lower lip.
More examples
- She rests her chin on her hand.
- She chins herself on the bar before lifting weights.
- I finish each workout with five chins.
Forms
chin · chins · chinned · chinning
chinless adjective — Having a very small or receding chin.
Similar words
- jaw
- Names the larger bony structure rather than just its protruding front.