Lagging definitions

Insulation used to prevent heat diffusion, as from a steam pipe.

A wooden frame built especially to support the sides of an arch until the keystone is positioned.

Thermal insulation for wrapping around pipes, boilers, etc.

A wood framework to support an arch while it is being built.

Planks or timber used to prevent rocks from falling in a shaft or drift.

Falling behind, not keeping up the pace.

Occurring after; indicating the later phase of.