postnasal drip

noun
a trickling of mucus onto the pharyngeal surface from the posterior portion of the nasal cavity, usually caused by a cold or allergy.

Origin:
1945–50

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Collins
World English Dictionary
postnasal drip (pəʊstˈneɪzəl)
 
n
med a mucus secretion from the rear part of the nasal cavity into the nasopharynx, usually as the result of a cold or an allergy

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

postnasal drip n.
The chronic secretion of mucus from the posterior nasal cavities.

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
Decongestants help clear a runny nose and relieve postnasal drip.
Postnasal drip, sore throat, and nasal discharge usually occur with these headaches.
There may also be mucus drainage in the back of the throat, called postnasal drip.
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