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blow (one's) nose
To breathe forcefully through the nose to expel mucus into a tissue. My allergies are so bad right now that I have to blow my nose constantly just to be able to breathe.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
blow one's nose
to expel mucus and other material from the nose using air pressure from the lungs. Excuse me, I have to blow my nose. Bill blew his nose into his handkerchief.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.