fall behind

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verb (intr, adverb)
to drop back; fail to keep up
to be in arrears, as with a payment
Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

How to use fall behind in a sentence

Other Idioms and Phrases with fall behind

fall behind

Also, get behind.


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]


Be financially in arrears, as in He fell behind in his payments. [Mid-1800s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.