intransitive. To be negligent; to idle, loiter, delay.

intransitive. To sneak; to dawdle or lag behind.

intransitive. To move more slowly or make less progress than others; to fail to keep up; to lag behind (literal and figurative).

intransitive. To lag behind and retard progress.

Of a moving body of people or animals. To lengthen out into a straggling line, as in hunting, racing, etc.; to drop behind, fall away.

= lag, v.2 1a (Cf. also latch, v.2 2b.)

To let oneself fall behind or to the rear by making no effort to keep ahead or to the front.