bed: [OE] Bed is common throughout the Germanic languages (German bett, Dutch bed), and comes from a prehistoric Germanic *bathjam. Already in Old English times the word meant both ‘place for sleeping’ and ‘area for growing plants’, and if the latter is primary, it could mean that the word comes ultimately from the Indo-European base *bhodh-, source of Latin fodere ‘dig’ (from which English gets fosse and fossil), and that the underlying notion of a bed was therefore originally of a sleeping place dug or scraped in the ground, like an animal’s lair. => fosse, fossil
Old English beddian "to provide with a bed or lodgings," from bed (n.). From c. 1300 as "to go to bed," also "to copulate with, to go to bed with;" 1440 as "to lay out (land) in plots or beds." Related: Bedded; bedding.
Old English bedd "bed, couch, resting place, garden plot," from Proto-Germanic *badjam "sleeping place dug in the ground" (cognates: Old Frisian, Old Saxon bed, Middle Dutch bedde, Old Norse beðr, Old High German betti, German Bett, Gothic badi "bed"), from PIE root *bhedh- "to dig, pierce" (cognates: Hittite beda- "to pierce, prick," Greek bothyros "pit," Latin fossa "ditch," Lithuanian bedre "to dig," Breton bez "grave"). Both "sleeping" and "gardening" senses are in Old English. Meaning "bottom of a lake, sea, watercourse" is from 1580s.