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.
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Source: A Dictionary of American Idioms
