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back-lining
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back-lining n.
Brit. 
/ˈbakˌlʌɪnɪŋ/
, /ˈbakˌlʌɪnɪŋ/U.S. /ˈbækˌlaɪnɪŋ/
in Architecture, the piece of a sash-frame parallel to the pulley piece and next to the jamb on either side (Gwilt 1842)./ˈbækˌlaɪnɪŋ/<
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