A strap or band that passes under the chin, typically used to secure a helmet, hat, or protective gear.
Compound of 'chin' and 'band.' This practical term has been in use since the 15th century to describe the functional straps on military helmets and headgear.
Medieval knights and modern motorcycle riders both rely on chin bands for the same reason: the chin and jaw are vulnerable areas, so securing helmets there prevents serious injury.
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