originally a boxing term. refers to the resilience a fighter has, especially in regard to blows to the head.
someone who cannot handle getting hit in a fight very well is said to have a
weak chin or a
glass jaw. someone who can handle lots of abuse is said to have a
strong chin.
dude 1: man, that guy's really taking a beating!
dude 2: yeah, but he's still fighting, look at him, it's like the
punches aren't even affecting him.
dude 1: he's got a
hell of a
chin on him, that's for sure.