empty nest

empty nest idiom
The home of parents whose children have grown up and moved out. For example, Now that they had an empty nest, Jim and Jane opened a bed-and-breakfast. This expression, alluding to a nest from which baby birds have flown, gave rise to such related ones as empty-nester, for a parent whose children had moved out, and empty-nest syndrome, for the state of mind of parents whose children had left. [c. 1970]

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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