VI.BE

CHIN

noun

1. the protruding part of the face below the mouth, formed by the apex of the lower jaw.
2. "grey stubble covered his cheeks and chin"

verb

INFORMAL

1. hit or punch (someone) on the chin.

"he looked about ready to chin someone"

1. draw one's body up so that one's chin is level with or above (a horizontal bar) with one's feet off the ground, as an exercise.

"each boy must chin a bar four times"