lagging: Meaning and Definition of

lag•ging

1. the act of falling or staying behind.

1. lingering; loitering; slow and dragging: lagging steps.

lag•ging

1. the act of covering a boiler, oil tank, etc., with heat-insulating material.
2. the covering formed.
3. the material used.
4. a number of boards or the like joined together side by side to line an excavation.
5. a number of lags, taken as a whole.