As a noun, fastening devices with a frame and prong for securing straps or belts. As a verb, third person singular of buckle; to fasten with a buckle or to collapse under pressure.
From Old French 'bocle' meaning 'boss of a shield', from Latin 'buccula' (cheek strap of a helmet), diminutive of 'bucca' (cheek). The meaning shifted from protective gear to fastening devices as the functional element became more important than the decorative.
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