Confined to bed due to illness, injury, or infirmity; unable to leave one's bed.
From Old English 'bedrida' meaning 'bed rider,' where 'rida' meant 'rider' or 'one who is mounted on.' The sense evolved from 'riding' a bed to being confined to it, showing how metaphors of movement can describe immobility.
The Old English literally meant 'bed rider,' creating a poetic image of someone mounted on their bed like a horse. This same 'ride' root appears in 'road' and 'raid,' showing how concepts of movement paradoxically describe the inability to move.
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