Definition of "lag"
A gap, a delay; an interval created by something not keeping up; a latency.
A prisoner, a criminal.
A minigame of billiards, where the order of the play is determined by testing who can get a ball closest to the bottom rail by shooting it onto the end rail.
To fail to keep up (the pace), to fall behind.
To cover (for example, pipes) with felt strips or similar material.
To transport as a punishment for crime.