Many first-class athletes, military personnel and research experts have such a chin... even if the person is not in these positions, and loves sports very much.
Such a chin indicates that the person is...
he has energy,
and determination in times of distress.
She/he can keep secrets and learn from success and failure.
Also without being destructive and vindictive like people with prominent angular jaw bones... he takes responsibilities in the family as well.
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