bedridden

The story

1. Old English · inherited frombedreda“bedridden”
2. Middle English · inherited frombedreden
3. English todaybedridden

From Middle English bedreden (also as bedrede), from Old English bedreda (“bedridden”, adj.), from bedreda, bedrida, bæddryda (“one who is bedridden”, noun), from bed, bedd (“bed”) + rida (“rider”), with -en by analogy with past participle adjectives.