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also bed-ridden, mid-14c., from adjectival use of late Old English bæddrædæn "bedridden (man)," from bedrid, from Old English bedreda, literally "bedrider, bedridden (man)," from bed + rida "rider" (see ride (v.)). Originally a noun, it became an adjective in Middle English and acquired an -en on the analogy of past participle adjectives from strong verbs such as ride.
bedridden bed·rid·den (běd'rĭd'n) or bed·rid (-rĭd')
Confined to bed because of illness or infirmity.