When you sneeze, you blow air forcefully (and involuntarily) out of your nose and mouth, possibly while making a sound that might be spelled "achoo!" Allergies, pepper, and dust are all famous for making people sneeze.

Behind every sneeze is some kind of irritant, a foreign substance that bothers the mucous membranes inside your nose. Pollen, cat dander, and the inflammation of your nose caused by a cold virus can all cause a sneeze (or several sneezes). When you sneeze, muscles in your face, neck, and chest contract reflexively. In rare cases, very bright lights or eating a large meal can make people sneeze. Go figure!

Definitions of sneeze
  1. verb
    exhale spasmodically, as when an irritant entered one's nose
    “Pepper makes me sneeze
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    type of:
    act involuntarily, act reflexively
    act in an uncontrolled manner
  2. noun
    a symptom consisting of the involuntary expulsion of air from the nose
    synonyms: sneezing, sternutation
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    type of:
    inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response, unconditioned reflex
    an automatic instinctive unlearned reaction to a stimulus
    (medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease
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