I. ˈlagiŋ noun
( -s )
Etymology: from lagging, gerund of lag (IV)
slang chiefly Britain : a term or sentence of imprisonment, transportation, or penal servitude
II. “, -aag-, -aig- noun
( -s )
Etymology: lag (VI) + -ing
: a lag or material used for making lags: as
a. : material applied for thermal insulation especially around a cylindrical object
during cold weather, the oil tank and the oil lines may be covered with asbestos padding, called lagging , to keep the oil warm during flight — B.A.Shields
b. : poles or planking erected to prevent cave-ins in earthwork (as in a mine or tunnel)
c. : wooden strips for transferring to the centering form the weight of an arch under construction
d. : a detachable protective surface (as on a pulley or a drum)