My husband was told our son has "glassjaw" Tried searching, but had no luck. Anyone have any idea what it is?

Question: Only other information he was told was that the bottom jaw is growing faster than the top.

Answers:
Glass Jaw, is a boxing term meaning a weak chin...... in other words your son can't take a hit.... As in boxing, even a weak punch to the jaw line can cause a KO

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The only time I have heard this phase was in boxing. If someone has a glass jaw, they can be knocked out fairly easy by their opponent.

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