behind in

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behind in (something)

Not having progressed as much as one would like or is necessary. I'm a little behind in my work right now, but I should have that report done by the end of the week. I'm going to be in debt for the rest of my life—I keep falling further and further behind in paying off my student loans.
See also: behind
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

behind in

1. Also, behind on. Late with; not progressing quickly enough with. For example, The builders are behind on this project, or I can't take time out or I'll be too far behind in my work. The same idea is also expressed as behind time, where time means a schedule or appointed time, as in The bus should have been here; it's behind time. [Early 1300s] Also see fall behind.
2. In arrears, owing more than one should. For example, Jane and Bob are behind in their payments, so the interest will mount up. [Late 1300s]
See also: behind
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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