it's a small world

it's a small world idiom
One encounters the same people, events or situations in unexpected places. For example, I never thought I'd run into Samantha at a ball game—it's a small world. [c. 1900]

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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