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back-casing
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back-casing n.
Brit. 
/ˈbakˌkeɪsɪŋ/
, /ˈbakˌkeɪsɪŋ/U.S. /ˈbækˌkeɪsɪŋ/
in Mining, a temporary shaft-lining of bricks, in front of which the permanent lining is built./ˈbækˌkeɪsɪŋ/<
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