fall behind

fall behind idiom
    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]

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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