when the dust has settled

when the dust has settled idiom
Also, after or once the dust settles. When matters have calmed down, as in The merger is complete, and when the dust has settled we can start on new projects. This idiom uses dust in the sense of “turmoil” or “commotion,” a usage dating from the first half of the 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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