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.