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under-blanket

ˈunder-blanket
  Also as one word.
  [under-1 5 b and under a. 2 a.]
  A blanket laid under the bottom sheet, as opp. to one used as a covering; now often an electric blanket.

[1746 Exmoor Scolding (E.D.S.) 30 That wan tha liv'st up to tha Cot, tha wart the Old Rager Hill's Under Bed-blonket.] 1819 S. Butler in Life & Lett. (1896) I. 164 One under and one good upper blanket. 1930 Daily Express 6 Oct. 9/7 (Advt.), Under blankets. 1971 Guardian 12 July 3/1 (Advt.), Electric underblanket. Single size approx. 50{pp} × 26{pp}. 1979 Daily Tel. 24 Jan. 14 A simple pin magnet together with a bag of corks placed between the under sheet and the underblanket has made me immune [from cramp].

Oxford English Dictionary

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