what does it mean to have a strong chin
Chin (combat sports) A fighter with a "good chin" refers to a fighter with the ability to absorb blows to the chin or jaw without being struck unconscious, which can also be called a "granite chin", an "iron chin" or similar. Generally, the jaw portion of the skull, and specifically the point of the chin, is the area most vulnerable to a knock-out blow and therefore having an exceptional tolerance to punishment in this area is a great advantage to a fighter.
Skull The skull is a bony structure that forms the head in most vertebrates. It supports the structures of the face and provides a protective cavity for the brain.[1] The skull is composed of two parts: the cranium and the mandible. In the human these two parts are the neurocranium and the viscerocranium or facial skeleton that includes the mandible as its largest bone. The skull forms the anterior most portion of the skeleton and is a product of cephalisationâ€”housing the brain, and several sensory structures such as the eyes, ears, nose, and mouth.[2] In humans these sensory structures are part of the facial skeleton.