Lag.

名词 lag.:

1. the act of slowing down or falling behind
   同义词：slowdown, lag, retardation
2. the time between one event, process, or period and another
   同义词：interim, meantime, meanwhile, lag
3. one of several thin slats of wood forming the sides of a barrel or bucket
   同义词：stave, lag

动词 lag.:

1. hang (back) or fall (behind) in movement, progress, development, etc.
   同义词：lag, dawdle, fall back, fall behind
2. lock up or confine, in or as in a jail
   同义词：imprison, incarcerate, lag, immure, put behind bars, jail, jug, gaol, put away, remand
3. throw or pitch at a mark, as with coins
   同义词：lag
4. cover with lagging to prevent heat loss
   同义词：lag