lag2

 
Pronunciation: /lag/

verb (lags, lagging, lagged)

[with object]
  • enclose or cover (a boiler, pipes, etc.) with material that provides heat insulation: all pipes and tanks in the attic should be lagged (as adjective lagged) a lagged hot-water tank

Derivatives

lagger

noun

Origin:

late 19th century: from earlier lag 'piece of insulating cover'