verb (used with object)
to diminish or end the congestion of.

1955–60; de- + congest, or by back formation from decongestant

decongestion, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

decongest de·con·gest (dē'kən-jěst')
v. de·con·gest·ed, de·con·gest·ing, de·con·gests
To relieve congestion, such as of the sinuses.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
And the second major goal is to decongest the peak time trains and buses.
These projects will decongest loaded unbalanced lines and enhance self sufficiency.
Visible and vital, bikers decongest roads and free up parking.
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