behind in

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.

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.
See also:
  • behind in (something)
  • behind schedule
  • be done to a turn
  • prepare for
  • deem it to be necessary
  • necessary
  • deem
  • deem it necessary
  • the necessary
  • late in the day
References in periodicals archive
Her problem might not be as bad as those of the friends and family she left behind in Mexico, but it's easier to address.
Lopez, who was four months behind in her rent, was now faced with a large phone bill and the need to wire money to her son for food and lodging.
Let India be powerful and let our armed forces never fall behind in the world.
Describing the building of the destroyer ship as a big achievement by India's technicians, engineers and defence experts, Modi said the government was committed to modernising the defence forces so "our jawans don't feel they are lagging behind in defending our nation.
citizen and lawful permanent resident family members of detainees, see Cindy Rodriguez, "Family Trouble: INS Roundup of Illegal Immigrants Leaves Those Left Behind in Turmoil," Boston Globe, April 27, 2002, B1.