Lagging definitions

lăg'ĭng
Insulation used to prevent heat diffusion, as from a steam pipe.
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A wooden frame built especially to support the sides of an arch until the keystone is positioned.
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Thermal insulation for wrapping around pipes, boilers, etc.
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A wood framework to support an arch while it is being built.
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Planks or timber used to prevent rocks from falling in a shaft or drift.
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Falling behind, not keeping up the pace.
adjective
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Occurring after; indicating the later phase of.
adjective
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The covering of something with strips of felt, wood etc, either as insulation or for protection.
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The material so used.
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Present participle of lag.
verb
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Origin of lagging

From lag