behind time

[behind time] {adv.} or {adj. phr.} 1a. Behind the correct time; slow.

That clock is behind time.

1b. Behind schedule; late.

The train is running behind time today.

2. Not keeping up; not at the proper time; overdue.

Your lessons are good, but why are you behind time?

We are behind time in paying the rent.

Contrast: AHEAD OF TIME, IN TIME, ON TIME.