"lagging" in the noun sense
insulation used to wrap around pipes or boilers or laid in attics to prevent loss of heat
"lagging" in the verb sense
1. lag, dawdle, fall back, fall behind
hang (back) or fall (behind) in movement, progress, development, etc.
2. imprison, incarcerate, lag, immure, put behind bars, jail, jug, gaol, put away, remand
lock up or confine, in or as in a jail
"The suspects were imprisoned without trial"
"the murderer was incarcerated for the rest of his life"
throw or pitch at a mark, as with coins
cover with lagging to prevent heat loss
Source: WordNet® (An amazing lexical database of English)
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