fall in with

fall in with idiom
  1. Agree with, be in harmony with, as in We happily fell in with his plans. [First half of 1600s]
  2. Associate with, become acquainted with (especially by chance), as in On the cruise we fell in with a couple from Boston. [Late 1500s]

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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