Reason to say "Gesundheit!" (6)

I believe the answer is:

sneeze

(Other definitions for sneeze that I've seen before include "Involuntary expiration of air" , "Exhale violently" , "Sternutation- see Zen (anag)" , "A sudden nasal expulsion" , "coming from cold" .)

I've seen this clue in The New York Times.

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