1
general::
Phrase(s): fall behind (with something)
Go to fall behind (in something)., Phrase(s): fall behind (someone or something)
to lag behind someone or something. • You have fallen behind everyone else in class. • Our production fell behind that of the other production line., Phrase(s): fall behind (in something) [and] fall behind (on something); fall behind (with something); get behind (in something); get behind (on something); get behind (with something)
to lag behind schedule in some kind of work or some other scheduled activity. • You are falling behind in your car payments. • I tried not to get behind on them. • Please don’t fall behind with your payments. • I won’t fall behind again.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Also, get behind. 1. Lag, fail to keep up, as in You really must keep up with the others; if you fall behind you could get lost. [First half of 1500s] 2. Be financially in arrears, as in He fell behind in his payments. [Mid-1800s]
American Heritage Idioms