Definition Of chins
draw one's body up so as to bring one's chin level with or above (a horizontal bar) with one's feet off the ground, as an exercise.
From the very start of his bodybuilding career, the Oak made chinning a priority in his workouts.
the protruding part of the face below the mouth, formed by the apex of the lower jaw.
Typical adult females have smaller jaws, noses, and chins , and thus eyes and cheekbones that are more prominent and appear to be larger than in typical males.