birdcage

The word 'birdcage' is a transparent compound formed from two Old English and Old French elements. 'Bird' descends from the Old English bridd, originally meaning a young bird or nestling, a term whose deeper origins are obscure but likely Germanic. 'Cage' entered English via Old French from the Latin cavea, meaning a hollow place, enclosure, or cavity, which itself derives from the Proto-Indo-European root keuə-, meaning 'to swell' or 'to be vaulted'. The compound's logic is perfectly literal: it names an enclosure specifically designed for birds. Over time, it has also gained metaphorical use to describe any confining or restrictive situation, directly extending from its primary, concrete meaning.

Structure: bird + cage bird: From Old English bridd (young bird), of uncertain origin. Functional role: The object contained. cage: From Old French cage, from Latin cavea (hollow, enclosure, coop). Functional role: The containing structure.