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"building for storage," 1855, earlier "light, temporary shelter" (late 15c., shadde), possibly a dialectal variant of a specialized use of shade (n.). Originally of the barest sort of shelter. Or from or influenced in sense development by Middle English schudde (shud) "a shed, hut."
"cast off," Old English sceadan, scadan "to divide, separate, part company; discriminate, decide; scatter abroad, cast about," strong verb (past tense scead, past participle sceadan), from Proto-Germanic *skaithan (cf. Old Saxon skethan, Old Frisian sketha, Middle Dutch sceiden, Dutch scheiden, Old High German sceidan, German scheiden "part, separate, distinguish," Gothic skaidan "separate"), from *skaith "divide, split."
According to Klein's sources, this probably is related to PIE root *skei- "to cut, separate, divide, part, split" (cf. Sanskrit chid-, Greek skhizein, Latin scindere "to split;" Lithuanian skedzu "I make thin, separate, divide;" Old Irish scian "knife;" Welsh chwydu "to break open"). Related: Shedding. A shedding-tooth (1799) was a milk-tooth or baby-tooth.
In reference to animals, "to lose hair, feathers, etc." recorded from c.1500; of trees losing leaves from 1590s; of clothes, 1858. This verb was used in Old English to gloss Late Latin words in the sense "to discriminate, to decide" that literally mean "to divide, separate" (cf. discern). Hence also scead (n.) "separation, distinction; discretion, understanding, reason;" sceadwisnes "discrimination, discretion."
Free of; unencumbered by: There it was again: ''risk.'' I wondered if I'd ever be shed of it (1871+)
To rehearse; practice one's part, role, etc, esp to do so alone and rigorously: Bix did plenty of woodshedding, playing alone/ I just learned a new technique and I've got to shed on it
[1930s+ Jazz musicians; fr the woodshed as the traditional place where one could be alone to work, think, smoke, etc]