Wiktionary
postnasal drip
n. (alternative spelling of post-nasal drip English)
WordNet
postnasal drip
n. chronic secretion of mucus from the rear of the nasal cavity into the nasopharynx
Usage examples of "postnasal drip".
It was worth sleeping thirty years just to wake up in a time when they had licked the common cold and nobody had a postnasal drip.
Well, okay, maybe shes just suffering from a bit of postnasal drip.